TY  - JOUR
AU  - Perendija, Jovana
AU  - Ljubić, Verica
AU  - Popović, Mina
AU  - Milošević, Dragana
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Kovač, Sabina
AU  - Cvetković, Slobodan
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7203
AB  - The discharge of industrial textile waters into water bodies leads to the accumulation of pollutants which are a serious threat to humans and the environment. The development of an efficient adsorbent for the removal of toxic organic dyes from water is of crucial importance. For that reason, this work aimed to elaborate on the potential application of a biosorbent obtained from waste Humulus lupulus stems (Hlup-BA) for the elimination of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems. The Hlup-BA was characterized using chemical composition analysis, by determination of particle size distribution, the point of zero charge (pHpzc), SEM, BET, EDS, XRD, and FTIR. Comprehensive analysis of Hlup-BA adsorption efficiency in a batch study showed that at the optimal conditions (e.g. contact time, 120 min; biosorbent dose, 2 g/L; dye concentration, 100 g/L; pH, 8 and temperature, 298 K), even 98.4 %, 98.8 %, and 98.5 % of MG, MB, and CV were removed, respectively. The results showed that the biosorption process followed pseudo-second-order kinetics. The equilibrium data were modeled using Langmuir, Freundlich, Sips, and Dubinnin-Radushkevich biosorption isotherms. High values of Hlup-BA biosorption capacities obtained from Langmuir isotherm were 398.9 mg g−1, 209.8 mg g−1, and 133.2 mg g−1 for MG, MB, and CV, thus proving Hlup-BA as an excellent biosorbent for removal of the tested dyes. The thermodynamic study indicated that the biosorption of these three dyes on Hlup-BA from aqueous solution is an endothermic, spontaneous, and thermodynamically stable process. The proposed mechanism of the biosorption process covers π-π interactions, electrostatic interactions, and hydrogen bonding. Furthermore, the data obtained by modeling in the fixed-bed column were also successfully correlated with the Thomas, Bohart-Adams, and Yoon–Nelson models. The very good fit of the results obtained in this way will greatly contribute to optimizing the pilot-scale operations for future wastewater treatment. Consequently, Hlup-BA can be an effective, cheap, and environmentally friendly biosorbent to eliminate methylene blue, malachite green, and crystal violet dyes from the aqueous solution in batch and column systems.
PB  - Elsevier
T2  - Journal of Molecular Liquids
T1  - Assessment of waste hop (Humulus Lupulus) stems as a biosorbent for the removal of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems: Biosorption process and mechanism
VL  - 394
SP  - 123770
DO  - 10.1016/j.molliq.2023.123770
ER  - 

@article{
author = "Perendija, Jovana and Ljubić, Verica and Popović, Mina and Milošević, Dragana and Arsenijević, Zorana and Đuriš, Mihal and Kovač, Sabina and Cvetković, Slobodan",
year = "2024",
abstract = "The discharge of industrial textile waters into water bodies leads to the accumulation of pollutants which are a serious threat to humans and the environment. The development of an efficient adsorbent for the removal of toxic organic dyes from water is of crucial importance. For that reason, this work aimed to elaborate on the potential application of a biosorbent obtained from waste Humulus lupulus stems (Hlup-BA) for the elimination of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems. The Hlup-BA was characterized using chemical composition analysis, by determination of particle size distribution, the point of zero charge (pHpzc), SEM, BET, EDS, XRD, and FTIR. Comprehensive analysis of Hlup-BA adsorption efficiency in a batch study showed that at the optimal conditions (e.g. contact time, 120 min; biosorbent dose, 2 g/L; dye concentration, 100 g/L; pH, 8 and temperature, 298 K), even 98.4 %, 98.8 %, and 98.5 % of MG, MB, and CV were removed, respectively. The results showed that the biosorption process followed pseudo-second-order kinetics. The equilibrium data were modeled using Langmuir, Freundlich, Sips, and Dubinnin-Radushkevich biosorption isotherms. High values of Hlup-BA biosorption capacities obtained from Langmuir isotherm were 398.9 mg g−1, 209.8 mg g−1, and 133.2 mg g−1 for MG, MB, and CV, thus proving Hlup-BA as an excellent biosorbent for removal of the tested dyes. The thermodynamic study indicated that the biosorption of these three dyes on Hlup-BA from aqueous solution is an endothermic, spontaneous, and thermodynamically stable process. The proposed mechanism of the biosorption process covers π-π interactions, electrostatic interactions, and hydrogen bonding. Furthermore, the data obtained by modeling in the fixed-bed column were also successfully correlated with the Thomas, Bohart-Adams, and Yoon–Nelson models. The very good fit of the results obtained in this way will greatly contribute to optimizing the pilot-scale operations for future wastewater treatment. Consequently, Hlup-BA can be an effective, cheap, and environmentally friendly biosorbent to eliminate methylene blue, malachite green, and crystal violet dyes from the aqueous solution in batch and column systems.",
publisher = "Elsevier",
journal = "Journal of Molecular Liquids",
title = "Assessment of waste hop (Humulus Lupulus) stems as a biosorbent for the removal of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems: Biosorption process and mechanism",
volume = "394",
pages = "123770",
doi = "10.1016/j.molliq.2023.123770"
}

Perendija, J., Ljubić, V., Popović, M., Milošević, D., Arsenijević, Z., Đuriš, M., Kovač, S.,& Cvetković, S.. (2024). Assessment of waste hop (Humulus Lupulus) stems as a biosorbent for the removal of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems: Biosorption process and mechanism. in Journal of Molecular Liquids
Elsevier., 394, 123770.
https://doi.org/10.1016/j.molliq.2023.123770

Perendija J, Ljubić V, Popović M, Milošević D, Arsenijević Z, Đuriš M, Kovač S, Cvetković S. Assessment of waste hop (Humulus Lupulus) stems as a biosorbent for the removal of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems: Biosorption process and mechanism. in Journal of Molecular Liquids. 2024;394:123770.
doi:10.1016/j.molliq.2023.123770 .

Perendija, Jovana, Ljubić, Verica, Popović, Mina, Milošević, Dragana, Arsenijević, Zorana, Đuriš, Mihal, Kovač, Sabina, Cvetković, Slobodan, "Assessment of waste hop (Humulus Lupulus) stems as a biosorbent for the removal of malachite green, methylene blue, and crystal violet from aqueous solution in batch and fixed-bed column systems: Biosorption process and mechanism" in Journal of Molecular Liquids, 394 (2024):123770,
https://doi.org/10.1016/j.molliq.2023.123770 . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Šućurović, Katarina
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Krstić, Sanja
AU  - Bošković-Vragolović, Nevenka
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7410
AB  - In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds.
AB  - У овом раду је одређиван коефицијент преноса масе флуид-зид у инверзнофлуидизованом слоју применом адсорпционе методе. Експерименти су вршени у колони  пречника 45 мм са сферичним и несферичним честицама полипропилена и полиетилена  пречника 3.3-4.9 мм и густине око 930 кг м-3. Као флуидизациони медијум коришћен је  разблажени раствор метиленски плавог који је адсорбован на делу површине колоне на  силикагелу. Добијени резултати показали су да присуство честица при инверзној  флуидизацији не доприноси значајно преносу масе у поређењу са утицајем честица на  пренос масе у конвенционално флуидизованим слојевима. Због тога је у анализу уведен  концепт псеудофлуида и изведена је емпиријска корелација за одређивање коефицијента  преноса масе. Извршено је поређење добијених резултата са литературним корелацијама за  инверзну и конвенционалну флуидизације.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mass transfer in inverse fluidized beds
T1  - Пренос масе у инверзно флуидизованом слоју
VL  - 88
IS  - 9
SP  - 905
EP  - 919
DO  - 10.2298/JSC230116016J
ER  - 

@article{
author = "Jaćimovski, Darko and Šućurović, Katarina and Đuriš, Mihal and Arsenijević, Zorana and Krstić, Sanja and Bošković-Vragolović, Nevenka",
year = "2023",
abstract = "In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds., У овом раду је одређиван коефицијент преноса масе флуид-зид у инверзнофлуидизованом слоју применом адсорпционе методе. Експерименти су вршени у колони  пречника 45 мм са сферичним и несферичним честицама полипропилена и полиетилена  пречника 3.3-4.9 мм и густине око 930 кг м-3. Као флуидизациони медијум коришћен је  разблажени раствор метиленски плавог који је адсорбован на делу површине колоне на  силикагелу. Добијени резултати показали су да присуство честица при инверзној  флуидизацији не доприноси значајно преносу масе у поређењу са утицајем честица на  пренос масе у конвенционално флуидизованим слојевима. Због тога је у анализу уведен  концепт псеудофлуида и изведена је емпиријска корелација за одређивање коефицијента  преноса масе. Извршено је поређење добијених резултата са литературним корелацијама за  инверзну и конвенционалну флуидизације.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mass transfer in inverse fluidized beds, Пренос масе у инверзно флуидизованом слоју",
volume = "88",
number = "9",
pages = "905-919",
doi = "10.2298/JSC230116016J"
}

Jaćimovski, D., Šućurović, K., Đuriš, M., Arsenijević, Z., Krstić, S.,& Bošković-Vragolović, N.. (2023). Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 88(9), 905-919.
https://doi.org/10.2298/JSC230116016J

Jaćimovski D, Šućurović K, Đuriš M, Arsenijević Z, Krstić S, Bošković-Vragolović N. Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society. 2023;88(9):905-919.
doi:10.2298/JSC230116016J .

Jaćimovski, Darko, Šućurović, Katarina, Đuriš, Mihal, Arsenijević, Zorana, Krstić, Sanja, Bošković-Vragolović, Nevenka, "Mass transfer in inverse fluidized beds" in Journal of the Serbian Chemical Society, 88, no. 9 (2023):905-919,
https://doi.org/10.2298/JSC230116016J . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Šućurović, Katarina
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Krstić, Sanja
AU  - Bošković-Vragolović, Nevenka
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6303
AB  - In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds.
AB  - У овом раду је одређиван коефицијент преноса масе флуид-зид у инверзнофлуидизованом слоју применом адсорпционе методе. Експерименти су вршени у колони  пречника 45 мм са сферичним и несферичним честицама полипропилена и полиетилена  пречника 3.3-4.9 мм и густине око 930 кг м-3. Као флуидизациони медијум коришћен је  разблажени раствор метиленски плавог који је адсорбован на делу површине колоне на  силикагелу. Добијени резултати показали су да присуство честица при инверзној  флуидизацији не доприноси значајно преносу масе у поређењу са утицајем честица на  пренос масе у конвенционално флуидизованим слојевима. Због тога је у анализу уведен  концепт псеудофлуида и изведена је емпиријска корелација за одређивање коефицијента  преноса масе. Извршено је поређење добијених резултата са литературним корелацијама за  инверзну и конвенционалну флуидизације.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Mass transfer in inverse fluidized beds
T1  - Пренос масе у инверзно флуидизованом слоју
VL  - 88
IS  - 9
SP  - 905
EP  - 919
DO  - 10.2298/JSC230116016J
ER  - 

@article{
author = "Jaćimovski, Darko and Šućurović, Katarina and Đuriš, Mihal and Arsenijević, Zorana and Krstić, Sanja and Bošković-Vragolović, Nevenka",
year = "2023",
abstract = "In this work, the coefficient of fluid-wall mass transfer in an inverse fluidized bed was determined using the adsorption method. The experiments were carried out in a column with a diameter of 45 mm with spherical and non-spherical particles of polypropylene and polyethylene with a diameter of 3.3-4.9 mm and a density of about 930 kg m-3. A diluted solution of methylene blue was used as a fluidization medium, which was adsorbed on part of the surface of the column on silica gel. The obtained results showed that the presence of particles during inverse fluidization does not contribute significantly to mass transfer compared to the influence of particles on transfer in conventional fluidized beds. Therefore, the pseudofluid concept was introduced into the analysis and an empirical correlation was performed to determine the mass transfer coefficient. The obtained results were compared with literature correlations for inverse and conventional fluidized beds., У овом раду је одређиван коефицијент преноса масе флуид-зид у инверзнофлуидизованом слоју применом адсорпционе методе. Експерименти су вршени у колони  пречника 45 мм са сферичним и несферичним честицама полипропилена и полиетилена  пречника 3.3-4.9 мм и густине око 930 кг м-3. Као флуидизациони медијум коришћен је  разблажени раствор метиленски плавог који је адсорбован на делу површине колоне на  силикагелу. Добијени резултати показали су да присуство честица при инверзној  флуидизацији не доприноси значајно преносу масе у поређењу са утицајем честица на  пренос масе у конвенционално флуидизованим слојевима. Због тога је у анализу уведен  концепт псеудофлуида и изведена је емпиријска корелација за одређивање коефицијента  преноса масе. Извршено је поређење добијених резултата са литературним корелацијама за  инверзну и конвенционалну флуидизације.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Mass transfer in inverse fluidized beds, Пренос масе у инверзно флуидизованом слоју",
volume = "88",
number = "9",
pages = "905-919",
doi = "10.2298/JSC230116016J"
}

Jaćimovski, D., Šućurović, K., Đuriš, M., Arsenijević, Z., Krstić, S.,& Bošković-Vragolović, N.. (2023). Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 88(9), 905-919.
https://doi.org/10.2298/JSC230116016J

Jaćimovski D, Šućurović K, Đuriš M, Arsenijević Z, Krstić S, Bošković-Vragolović N. Mass transfer in inverse fluidized beds. in Journal of the Serbian Chemical Society. 2023;88(9):905-919.
doi:10.2298/JSC230116016J .

Jaćimovski, Darko, Šućurović, Katarina, Đuriš, Mihal, Arsenijević, Zorana, Krstić, Sanja, Bošković-Vragolović, Nevenka, "Mass transfer in inverse fluidized beds" in Journal of the Serbian Chemical Society, 88, no. 9 (2023):905-919,
https://doi.org/10.2298/JSC230116016J . .

TY  - JOUR
AU  - Šućurović, Katarina
AU  - Jaćimovski, Darko
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Bošković-Vragolović, Nevenka
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5956
AB  - To define the fluid-dynamic properties of inverse fluidized beds, studies of the minimum fluidization velocity and bed expansion were performed in this work. The experiments were performed in
an inverse fluidized bed of polypropylene and polystyrene particles in a cylindrical column using
water and an aqueous glycerol solution of different concentrations as fluidizing medium. The
dependence of the bed porosity on the superficial velocity of the fluid was determined experimentally for all the particles studied and different fluidizing media. The influence of fluidizing
medium viscosity and particle density on the expansion of the inverse fluidized bed and on the
minimum fluidization velocity was investigated. Comparison of the experimental data for the
expansion of the inverse fluidized bed and the values calculated by the Richardson-Zaki
correlation for the conventional fluidized bed showed some deviation, but the experimentally
determined data were found to follow the shape of the Richardson-Zaki curve. In this paper, a
correlation for the expansion of inverse fluidized beds is proposed
PB  - Taylor & Francis
T2  - Particulate Science and Technology
T1  - Minimum fluidization velocity and bed expansion of the inverse fluidized bed
DO  - 10.1080/02726351.2023.2182732
ER  - 

@article{
author = "Šućurović, Katarina and Jaćimovski, Darko and Đuriš, Mihal and Arsenijević, Zorana and Bošković-Vragolović, Nevenka",
year = "2023",
abstract = "To define the fluid-dynamic properties of inverse fluidized beds, studies of the minimum fluidization velocity and bed expansion were performed in this work. The experiments were performed in
an inverse fluidized bed of polypropylene and polystyrene particles in a cylindrical column using
water and an aqueous glycerol solution of different concentrations as fluidizing medium. The
dependence of the bed porosity on the superficial velocity of the fluid was determined experimentally for all the particles studied and different fluidizing media. The influence of fluidizing
medium viscosity and particle density on the expansion of the inverse fluidized bed and on the
minimum fluidization velocity was investigated. Comparison of the experimental data for the
expansion of the inverse fluidized bed and the values calculated by the Richardson-Zaki
correlation for the conventional fluidized bed showed some deviation, but the experimentally
determined data were found to follow the shape of the Richardson-Zaki curve. In this paper, a
correlation for the expansion of inverse fluidized beds is proposed",
publisher = "Taylor & Francis",
journal = "Particulate Science and Technology",
title = "Minimum fluidization velocity and bed expansion of the inverse fluidized bed",
doi = "10.1080/02726351.2023.2182732"
}

Šućurović, K., Jaćimovski, D., Đuriš, M., Arsenijević, Z.,& Bošković-Vragolović, N.. (2023). Minimum fluidization velocity and bed expansion of the inverse fluidized bed. in Particulate Science and Technology
Taylor & Francis..
https://doi.org/10.1080/02726351.2023.2182732

Šućurović K, Jaćimovski D, Đuriš M, Arsenijević Z, Bošković-Vragolović N. Minimum fluidization velocity and bed expansion of the inverse fluidized bed. in Particulate Science and Technology. 2023;.
doi:10.1080/02726351.2023.2182732 .

Šućurović, Katarina, Jaćimovski, Darko, Đuriš, Mihal, Arsenijević, Zorana, Bošković-Vragolović, Nevenka, "Minimum fluidization velocity and bed expansion of the inverse fluidized bed" in Particulate Science and Technology (2023),
https://doi.org/10.1080/02726351.2023.2182732 . .

TY  - JOUR
AU  - Brzić, Danica
AU  - Pešić, Radojica
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5247
AB  - The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.
PB  - Taylor & Francis
T2  - Particulate Science and Technology
T1  - Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime
VL  - 41
IS  - 1
SP  - 75
EP  - 83
DO  - 10.1080/02726351.2022.2053015
ER  - 

@article{
author = "Brzić, Danica and Pešić, Radojica and Arsenijević, Zorana and Đuriš, Mihal and Bošković-Vragolović, Nevenka and Kaluđerović-Radoičić, Tatjana",
year = "2023",
abstract = "The present work concerns an experimental study on heat transfer in gas-solid fluidized bed of coarse (Geldart D) particles to a larger immersed sphere at high superficial velocities from 2 to 5.5 Umf. The heat transfer coefficient was determined by measuring the temperature of the test sphere during its heating in a fluidized bed in the temperature range of 65–175 °C. The test spheres of different sizes and different materials were utilized. For the given gas-particles system the flow regime changes from rapidly growing bubbles to turbulent fluidization at superficial velocity Uc ≈ 3Umf. It has been found that in rapidly growing bubbles regime, the heat transfer coefficient is higher for smaller test spheres while it is almost independent of the superficial gas velocity. In turbulent regime, the heat transfer coefficient increases with increase of gas velocity while the size of the test sphere exhibits less influence. In the rapidly growing bubbles regime, experimental data for heat transfer coefficient can be predicted adequately with correlation of Scott et al.. For the turbulent flow regime a new correlation for prediction of the heat transfer coefficient has been proposed.",
publisher = "Taylor & Francis",
journal = "Particulate Science and Technology",
title = "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime",
volume = "41",
number = "1",
pages = "75-83",
doi = "10.1080/02726351.2022.2053015"
}

Brzić, D., Pešić, R., Arsenijević, Z., Đuriš, M., Bošković-Vragolović, N.,& Kaluđerović-Radoičić, T.. (2023). Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology
Taylor & Francis., 41(1), 75-83.
https://doi.org/10.1080/02726351.2022.2053015

Brzić D, Pešić R, Arsenijević Z, Đuriš M, Bošković-Vragolović N, Kaluđerović-Radoičić T. Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime. in Particulate Science and Technology. 2023;41(1):75-83.
doi:10.1080/02726351.2022.2053015 .

Brzić, Danica, Pešić, Radojica, Arsenijević, Zorana, Đuriš, Mihal, Bošković-Vragolović, Nevenka, Kaluđerović-Radoičić, Tatjana, "Heat transfer to a sphere immersed in a fluidized bed of coarse particles with transition from bubbling to turbulent flow regime" in Particulate Science and Technology, 41, no. 1 (2023):75-83,
https://doi.org/10.1080/02726351.2022.2053015 . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Brzić, Danica
AU  - Garić Grulović, Radmila
AU  - Pjanović, Rada
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Bošković-Vragolović, Nevenka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5248
AB  - In this work the theoretical model for heat transfer from a wall to aliquid-solid fluidized bed by liquid convective mechanism has been proposed.The model is based on thickness of boundary layer and film theory. The keyparameter in the model is the distance between two adjacent particles whichcollide with the wall. According to the proposed model, the liquid convectiveheat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phaseflow. Additionally, the wall-to-bed heat transfer coefficient has been measuredexperimentally in water –glass particles fluidized bed, for different particle sizes.Comparison of the model prediction with experimental data has shown that sizeof the particles strongly influences the mechanism of heat transfer. For fineparticles of 0.8 mm in diameter, the liquid convective heat transfer modelrepresents adequately the experimental data, indicating that particle convectivemechanism is negligible. For coarse particles of 1.5 - 2 mm in diameter, theliquid convective heat transfer mechanism accounts for 60 % of the overall heattransfer coefficient
AB  - У овом раду развијен је теоријски модел преноса топлоте конвективним механизмомса зида колоне на течност у партикулативно флуидизованом слоју. Модел је заснован надебљини граничног слоја и теорији филма. Кључни параметар модела је растојање измеђудвe суседне честице које се сударају са зидом колоне. Према предложеном моделу преностоплоте конвекцијом на течност у флуидизованом слоју је 4 до 5 пута интензивнији него уједнофазном току. Коефицијенти преноса топлоте су експериментално одређени уфлуидизованом слоју вода-стаклене сфере, за различите пречнике честица. Поређењеексперименталних резултата и предвиђања модела је показало да пречник честица значајноутиче на механизам преноса топлоте. За веома ситне честице пречника 0.8 mm, моделпреноса топлоте конвекцијом на течност у потпуности репрезентује експерименталнерезултате, указујући да је пренос топлоте честицама занемарљив. За крупне честице,пречника 1.5 -2 mm, конвективни пренос на течност чини 60 % од укупног коефицијентапреноса топлоте
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Heat transfer by liquid convection in particulate fluidized beds
T1  - Пренос топлоте конвективним механизмом у партикулативно флуидизованом слоју
VL  - 87
IS  - 7-8
SP  - 911
EP  - 924
DO  - 10.2298/JSC211216020J
ER  - 

@article{
author = "Jaćimovski, Darko and Brzić, Danica and Garić Grulović, Radmila and Pjanović, Rada and Đuriš, Mihal and Arsenijević, Zorana and Bošković-Vragolović, Nevenka",
year = "2022",
abstract = "In this work the theoretical model for heat transfer from a wall to aliquid-solid fluidized bed by liquid convective mechanism has been proposed.The model is based on thickness of boundary layer and film theory. The keyparameter in the model is the distance between two adjacent particles whichcollide with the wall. According to the proposed model, the liquid convectiveheat transfer in a fluidized bed is 4 to 5 times more intense than in a single-phaseflow. Additionally, the wall-to-bed heat transfer coefficient has been measuredexperimentally in water –glass particles fluidized bed, for different particle sizes.Comparison of the model prediction with experimental data has shown that sizeof the particles strongly influences the mechanism of heat transfer. For fineparticles of 0.8 mm in diameter, the liquid convective heat transfer modelrepresents adequately the experimental data, indicating that particle convectivemechanism is negligible. For coarse particles of 1.5 - 2 mm in diameter, theliquid convective heat transfer mechanism accounts for 60 % of the overall heattransfer coefficient, У овом раду развијен је теоријски модел преноса топлоте конвективним механизмомса зида колоне на течност у партикулативно флуидизованом слоју. Модел је заснован надебљини граничног слоја и теорији филма. Кључни параметар модела је растојање измеђудвe суседне честице које се сударају са зидом колоне. Према предложеном моделу преностоплоте конвекцијом на течност у флуидизованом слоју је 4 до 5 пута интензивнији него уједнофазном току. Коефицијенти преноса топлоте су експериментално одређени уфлуидизованом слоју вода-стаклене сфере, за различите пречнике честица. Поређењеексперименталних резултата и предвиђања модела је показало да пречник честица значајноутиче на механизам преноса топлоте. За веома ситне честице пречника 0.8 mm, моделпреноса топлоте конвекцијом на течност у потпуности репрезентује експерименталнерезултате, указујући да је пренос топлоте честицама занемарљив. За крупне честице,пречника 1.5 -2 mm, конвективни пренос на течност чини 60 % од укупног коефицијентапреноса топлоте",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Heat transfer by liquid convection in particulate fluidized beds, Пренос топлоте конвективним механизмом у партикулативно флуидизованом слоју",
volume = "87",
number = "7-8",
pages = "911-924",
doi = "10.2298/JSC211216020J"
}

Jaćimovski, D., Brzić, D., Garić Grulović, R., Pjanović, R., Đuriš, M., Arsenijević, Z.,& Bošković-Vragolović, N.. (2022). Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 87(7-8), 911-924.
https://doi.org/10.2298/JSC211216020J

Jaćimovski D, Brzić D, Garić Grulović R, Pjanović R, Đuriš M, Arsenijević Z, Bošković-Vragolović N. Heat transfer by liquid convection in particulate fluidized beds. in Journal of the Serbian Chemical Society. 2022;87(7-8):911-924.
doi:10.2298/JSC211216020J .

Jaćimovski, Darko, Brzić, Danica, Garić Grulović, Radmila, Pjanović, Rada, Đuriš, Mihal, Arsenijević, Zorana, Bošković-Vragolović, Nevenka, "Heat transfer by liquid convection in particulate fluidized beds" in Journal of the Serbian Chemical Society, 87, no. 7-8 (2022):911-924,
https://doi.org/10.2298/JSC211216020J . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Šućurović, Katarina
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Bošković-Vragolović, Nevenka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5620
AB  - The movement of particles in the fluidized bed primarily determines the mixing in the bed and determines the transfer intensities that occur between the particles and the fluid. Experimental monitoring of the velocity of the marked particle was performed in an inversely fluidized bed of polypropylene, polyethylene, and polystyrene particles. The velocity of the marked particle was monitored in a two-dimensional column, where water and an aqueous solution of glycerin were used as the fluidization medium. Using the Tracker Video Analysis program (Tracker Video Analysis, Open Source Physics, 2003), the mean velocity of the marked particle was determined, as well as the distance crossed by the marked particle in the x and y directions. The influence of fluidization medium viscosity and particle density on the velocity of the marked particle was investigated. The results of experimental investigations have shown that the particle velocity distribution approximately follows the Maxwell distribution. Comparison of the measured values of the mean velocity in the inversely and conventionally fluidized bed showed a certain deviation. In this paper, a correlation for determining the mean particle velocity in an inversely fluidized bed is proposed.
PB  - Informa UK Limited
T2  - Particulate Science and Technology
T1  - Movement and velocity of a particle in an inverse fluidized bed
DO  - 10.1080/02726351.2022.2119625
ER  - 

@article{
author = "Jaćimovski, Darko and Šućurović, Katarina and Đuriš, Mihal and Arsenijević, Zorana and Bošković-Vragolović, Nevenka",
year = "2022",
abstract = "The movement of particles in the fluidized bed primarily determines the mixing in the bed and determines the transfer intensities that occur between the particles and the fluid. Experimental monitoring of the velocity of the marked particle was performed in an inversely fluidized bed of polypropylene, polyethylene, and polystyrene particles. The velocity of the marked particle was monitored in a two-dimensional column, where water and an aqueous solution of glycerin were used as the fluidization medium. Using the Tracker Video Analysis program (Tracker Video Analysis, Open Source Physics, 2003), the mean velocity of the marked particle was determined, as well as the distance crossed by the marked particle in the x and y directions. The influence of fluidization medium viscosity and particle density on the velocity of the marked particle was investigated. The results of experimental investigations have shown that the particle velocity distribution approximately follows the Maxwell distribution. Comparison of the measured values of the mean velocity in the inversely and conventionally fluidized bed showed a certain deviation. In this paper, a correlation for determining the mean particle velocity in an inversely fluidized bed is proposed.",
publisher = "Informa UK Limited",
journal = "Particulate Science and Technology",
title = "Movement and velocity of a particle in an inverse fluidized bed",
doi = "10.1080/02726351.2022.2119625"
}

Jaćimovski, D., Šućurović, K., Đuriš, M., Arsenijević, Z.,& Bošković-Vragolović, N.. (2022). Movement and velocity of a particle in an inverse fluidized bed. in Particulate Science and Technology
Informa UK Limited..
https://doi.org/10.1080/02726351.2022.2119625

Jaćimovski D, Šućurović K, Đuriš M, Arsenijević Z, Bošković-Vragolović N. Movement and velocity of a particle in an inverse fluidized bed. in Particulate Science and Technology. 2022;.
doi:10.1080/02726351.2022.2119625 .

Jaćimovski, Darko, Šućurović, Katarina, Đuriš, Mihal, Arsenijević, Zorana, Bošković-Vragolović, Nevenka, "Movement and velocity of a particle in an inverse fluidized bed" in Particulate Science and Technology (2022),
https://doi.org/10.1080/02726351.2022.2119625 . .

TY  - JOUR
AU  - Jovanović, Marina
AU  - Zlatanović, Snežana
AU  - Micić, Darko
AU  - Bacić, Dragan
AU  - Mitić-Ćulafić, Dragana
AU  - Đuriš, Mihal
AU  - Gorjanović, Stanislava Ž.
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5957
AB  - Following the idea of sustainability in food production, a yogurt premix based on beetroot (Beta vulgaris) pomace flour (BPF) was developed. BPF was granulated with lactose solution
containing lactic acid bacteria (LAB) by a fluidized bed. Particle size increased ~30%. A decrease in
Carr Index from 21.5 to 14.98 and Hausner ratio from 1.27 to 1.18 confirmed improved flowability
of granulated BPF, whereas a decrease in water activity implied better storability. Yogurts were
produced weekly from neat starters and granulated BPF (3% w/w) that were stored for up to one
month (4 ◦C). High viability of Streptococcus thermophilus was observed. Less pronounced syneresis,
higher inhibition of colon cancer cell viability (13.0–24.5%), and anti-Escherichia activity were ascribed
to BPF yogurts or their supernatants (i.e., extracted whey). Acceptable palatability for humans and
dogs was demonstrated. A survey revealed positive consumers’ attitudes toward the granulated
BPF as a premix for yogurts amended to humans and dogs. For the first time, BPF granulated with
LAB was used as a premix for a fermented beverage. An initial step in the conceptualization of a
novel DIY (do it yourself) formula for obtaining a fresh yogurt fortified with natural dietary fiber
and antioxidants has been accomplished.
PB  - MDPI
T2  - Foods
T1  - Functionality and Palatability of Yogurt Produced Using Beetroot Pomace Flour Granulated with Lactic Acid Bacteria
VL  - 10
IS  - 8
SP  - 1696
DO  - 10.3390/foods10081696
ER  - 

@article{
author = "Jovanović, Marina and Zlatanović, Snežana and Micić, Darko and Bacić, Dragan and Mitić-Ćulafić, Dragana and Đuriš, Mihal and Gorjanović, Stanislava Ž.",
year = "2021",
abstract = "Following the idea of sustainability in food production, a yogurt premix based on beetroot (Beta vulgaris) pomace flour (BPF) was developed. BPF was granulated with lactose solution
containing lactic acid bacteria (LAB) by a fluidized bed. Particle size increased ~30%. A decrease in
Carr Index from 21.5 to 14.98 and Hausner ratio from 1.27 to 1.18 confirmed improved flowability
of granulated BPF, whereas a decrease in water activity implied better storability. Yogurts were
produced weekly from neat starters and granulated BPF (3% w/w) that were stored for up to one
month (4 ◦C). High viability of Streptococcus thermophilus was observed. Less pronounced syneresis,
higher inhibition of colon cancer cell viability (13.0–24.5%), and anti-Escherichia activity were ascribed
to BPF yogurts or their supernatants (i.e., extracted whey). Acceptable palatability for humans and
dogs was demonstrated. A survey revealed positive consumers’ attitudes toward the granulated
BPF as a premix for yogurts amended to humans and dogs. For the first time, BPF granulated with
LAB was used as a premix for a fermented beverage. An initial step in the conceptualization of a
novel DIY (do it yourself) formula for obtaining a fresh yogurt fortified with natural dietary fiber
and antioxidants has been accomplished.",
publisher = "MDPI",
journal = "Foods",
title = "Functionality and Palatability of Yogurt Produced Using Beetroot Pomace Flour Granulated with Lactic Acid Bacteria",
volume = "10",
number = "8",
pages = "1696",
doi = "10.3390/foods10081696"
}

Jovanović, M., Zlatanović, S., Micić, D., Bacić, D., Mitić-Ćulafić, D., Đuriš, M.,& Gorjanović, S. Ž.. (2021). Functionality and Palatability of Yogurt Produced Using Beetroot Pomace Flour Granulated with Lactic Acid Bacteria. in Foods
MDPI., 10(8), 1696.
https://doi.org/10.3390/foods10081696

Jovanović M, Zlatanović S, Micić D, Bacić D, Mitić-Ćulafić D, Đuriš M, Gorjanović SŽ. Functionality and Palatability of Yogurt Produced Using Beetroot Pomace Flour Granulated with Lactic Acid Bacteria. in Foods. 2021;10(8):1696.
doi:10.3390/foods10081696 .

Jovanović, Marina, Zlatanović, Snežana, Micić, Darko, Bacić, Dragan, Mitić-Ćulafić, Dragana, Đuriš, Mihal, Gorjanović, Stanislava Ž., "Functionality and Palatability of Yogurt Produced Using Beetroot Pomace Flour Granulated with Lactic Acid Bacteria" in Foods, 10, no. 8 (2021):1696,
https://doi.org/10.3390/foods10081696 . .

TY  - JOUR
AU  - Ignjatović, Jelisaveta
AU  - Đuriš, Jelena
AU  - Đuriš, Mihal
AU  - Bočarski, Teodora
AU  - Vasiljević, Vanja
AU  - Aleksić, Ivana
AU  - Cvijić, Sandra
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4527
AB  - Hot-melt coating (HMC) is an alternative, solvent-free coating method generally used to modify substrate release rate and/or mask its unpleasant taste. The aim of this study was to assess two HMC methods (pan-coating and mortar-coating) by assaying functional properties of the coated material. The selected substrates included highly soluble sodium chloride (model substance) and caffeine (bitter drug), and the coating agent was glycerol distearate without/with the addition of liquid paraffin. Experiments with sodium chloride revealed that pan-coating yielded particles of more regular shape, while mortar-coating yielded samples of more uniform coating layer. The flowability of the coated material depended on the particle size. Sustained sodium chloride release was achieved for all mortar-coated and some pan-coated samples. The analysis of the results indicated mortar-coating as a preferable HMC method for caffeine coating. The resulting caffeine yield in the coated samples was high (99%), the material showed satisfactory mechanical properties and drug release from the coated particles was sustained. Overall, the obtained results suggest that both pan-and mortar-coating can be used to sustain the release of drugs with unpleasant taste, but mortar-coating can be considered as a more simple and practical method that can be potentially used in compounding pharmacies.
AB  - Oblaganje topljenjem je alternativna metoda oblaganja, bez upotrebe rastvarača i uglavnom
se koristi za modifikaciju brzine rastvaranja i/ili maskiranje neprijatnog ukusa supstrata. Cilj ovog
rada je da se procene dve metode za oblaganje topljenjem (oblaganje u bubnju i oblaganje u
pateni), ispitivanjem funkcionalnih karakteristika obloženog materijala. Izabrana su dva visoko
rastvorljiva supstrata: natrijum-hlorid (model supstanca) i kofein (lekovita supstanca gorkog
ukusa), a za oblaganje je korišćen glicerildistearat bez/sa dodatkom tečnog parafina.
Eksperimenti sa natrijum-hloridom su pokazali da su oblaganjem u bubnju dobijene čestice
pravilnijeg oblika, dok su oblaganjem u pateni dobijeni uzorci sa ujednačenijom oblogom.
Protočnost obloženog materijala je zavisila od veličine čestica. Usporeno rastvaranje natrijumhlorida
postignuto je kod svih uzoraka obloženih u pateni i kod nekih uzoraka obloženih u bubnju.
Analiza rezultata je izdvojila oblaganje u pateni kao pogodniju metodu za oblaganje kofeina.
Dobijeni prinos obloženih čestica kofeina je bio visok (99%), obloženi materijal je imao
zadovoljavajuće mehaničke osobine i postignuta je usporena brzina rastvaranja kofeina. Sumarno,
dobijeni rezultati su pokazali da se i oblaganje u bubnju i u pateni mogu koristiti za usporavanje
rastvaranja lekovitih supstanci neprijatnog ukusa, no oblaganje u pateni predstavlja jednostavniju
i praktičniju metodu koja se potencijalno može koristiti i u izradi magistralnih lekova.
PB  - Serbia : Pharmaceutical Association of Serbia
T2  - Arhiv za Farmaciju
T1  - Assessment of hot-melt coating methods for multiparticulate substrates: Mortar-coating vs. pan-coating
T1  - Procena metoda za oblaganje višečestičnih supstrata topljenjem: oblaganje u pateni vs. oblaganje u bubnju
VL  - 71
IS  - 1
SP  - 35
EP  - 54
DO  - 10.5937/arhfarm71-30266
ER  - 

@article{
author = "Ignjatović, Jelisaveta and Đuriš, Jelena and Đuriš, Mihal and Bočarski, Teodora and Vasiljević, Vanja and Aleksić, Ivana and Cvijić, Sandra",
year = "2021",
abstract = "Hot-melt coating (HMC) is an alternative, solvent-free coating method generally used to modify substrate release rate and/or mask its unpleasant taste. The aim of this study was to assess two HMC methods (pan-coating and mortar-coating) by assaying functional properties of the coated material. The selected substrates included highly soluble sodium chloride (model substance) and caffeine (bitter drug), and the coating agent was glycerol distearate without/with the addition of liquid paraffin. Experiments with sodium chloride revealed that pan-coating yielded particles of more regular shape, while mortar-coating yielded samples of more uniform coating layer. The flowability of the coated material depended on the particle size. Sustained sodium chloride release was achieved for all mortar-coated and some pan-coated samples. The analysis of the results indicated mortar-coating as a preferable HMC method for caffeine coating. The resulting caffeine yield in the coated samples was high (99%), the material showed satisfactory mechanical properties and drug release from the coated particles was sustained. Overall, the obtained results suggest that both pan-and mortar-coating can be used to sustain the release of drugs with unpleasant taste, but mortar-coating can be considered as a more simple and practical method that can be potentially used in compounding pharmacies., Oblaganje topljenjem je alternativna metoda oblaganja, bez upotrebe rastvarača i uglavnom
se koristi za modifikaciju brzine rastvaranja i/ili maskiranje neprijatnog ukusa supstrata. Cilj ovog
rada je da se procene dve metode za oblaganje topljenjem (oblaganje u bubnju i oblaganje u
pateni), ispitivanjem funkcionalnih karakteristika obloženog materijala. Izabrana su dva visoko
rastvorljiva supstrata: natrijum-hlorid (model supstanca) i kofein (lekovita supstanca gorkog
ukusa), a za oblaganje je korišćen glicerildistearat bez/sa dodatkom tečnog parafina.
Eksperimenti sa natrijum-hloridom su pokazali da su oblaganjem u bubnju dobijene čestice
pravilnijeg oblika, dok su oblaganjem u pateni dobijeni uzorci sa ujednačenijom oblogom.
Protočnost obloženog materijala je zavisila od veličine čestica. Usporeno rastvaranje natrijumhlorida
postignuto je kod svih uzoraka obloženih u pateni i kod nekih uzoraka obloženih u bubnju.
Analiza rezultata je izdvojila oblaganje u pateni kao pogodniju metodu za oblaganje kofeina.
Dobijeni prinos obloženih čestica kofeina je bio visok (99%), obloženi materijal je imao
zadovoljavajuće mehaničke osobine i postignuta je usporena brzina rastvaranja kofeina. Sumarno,
dobijeni rezultati su pokazali da se i oblaganje u bubnju i u pateni mogu koristiti za usporavanje
rastvaranja lekovitih supstanci neprijatnog ukusa, no oblaganje u pateni predstavlja jednostavniju
i praktičniju metodu koja se potencijalno može koristiti i u izradi magistralnih lekova.",
publisher = "Serbia : Pharmaceutical Association of Serbia",
journal = "Arhiv za Farmaciju",
title = "Assessment of hot-melt coating methods for multiparticulate substrates: Mortar-coating vs. pan-coating, Procena metoda za oblaganje višečestičnih supstrata topljenjem: oblaganje u pateni vs. oblaganje u bubnju",
volume = "71",
number = "1",
pages = "35-54",
doi = "10.5937/arhfarm71-30266"
}

Ignjatović, J., Đuriš, J., Đuriš, M., Bočarski, T., Vasiljević, V., Aleksić, I.,& Cvijić, S.. (2021). Assessment of hot-melt coating methods for multiparticulate substrates: Mortar-coating vs. pan-coating. in Arhiv za Farmaciju
Serbia : Pharmaceutical Association of Serbia., 71(1), 35-54.
https://doi.org/10.5937/arhfarm71-30266

Ignjatović J, Đuriš J, Đuriš M, Bočarski T, Vasiljević V, Aleksić I, Cvijić S. Assessment of hot-melt coating methods for multiparticulate substrates: Mortar-coating vs. pan-coating. in Arhiv za Farmaciju. 2021;71(1):35-54.
doi:10.5937/arhfarm71-30266 .

Ignjatović, Jelisaveta, Đuriš, Jelena, Đuriš, Mihal, Bočarski, Teodora, Vasiljević, Vanja, Aleksić, Ivana, Cvijić, Sandra, "Assessment of hot-melt coating methods for multiparticulate substrates: Mortar-coating vs. pan-coating" in Arhiv za Farmaciju, 71, no. 1 (2021):35-54,
https://doi.org/10.5937/arhfarm71-30266 . .

TY  - JOUR
AU  - Đuriš, Jelena
AU  - Cirin-Varađan, Slobodanka
AU  - Aleksić, Ivana
AU  - Đuriš, Mihal
AU  - Cvijić, Sandra
AU  - Ibrić, Svetlana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4693
AB  - Co-processing (CP) provides superior properties to excipients and has become a reliable option to facilitated formulation and manufacturing of variety of solid dosage forms. Development of directly compressible formulations with high doses of poorly flowing/compressible active pharmaceutical ingredients, such as paracetamol, remains a great challenge for the pharmaceutical industry due to the lack of understanding of the interplay between the formulation properties, process of compaction, and stages of tablets’ detachment and ejection. The aim of this study was to analyze the influence of the compression load, excipients’ co-processing and the addition of paracetamol on the obtained tablets’ tensile strength and the specific parameters of the tableting process, such as (net) compression work, elastic recovery, detachment, and ejection work, as well as the ejection force. Two types of neural networks were used to analyze the data: classification (Kohonen network) and regression networks (multilayer perceptron and radial basis function), to build prediction models and identify the variables that are predominantly affecting the tableting process and the obtained tablets’ tensile strength. It has been demonstrated that sophisticated data-mining methods are necessary to interpret complex phenomena regarding the effect of co-processing on tableting properties of directly compressible excipients.
PB  - MDPI
T2  - Pharmaceutics
T1  - Application of machine-learning algorithms for better understanding of tableting properties of lactose co-processed with lipid excipients
VL  - 13
IS  - 5
SP  - 663
DO  - 10.3390/pharmaceutics13050663
ER  - 

@article{
author = "Đuriš, Jelena and Cirin-Varađan, Slobodanka and Aleksić, Ivana and Đuriš, Mihal and Cvijić, Sandra and Ibrić, Svetlana",
year = "2021",
abstract = "Co-processing (CP) provides superior properties to excipients and has become a reliable option to facilitated formulation and manufacturing of variety of solid dosage forms. Development of directly compressible formulations with high doses of poorly flowing/compressible active pharmaceutical ingredients, such as paracetamol, remains a great challenge for the pharmaceutical industry due to the lack of understanding of the interplay between the formulation properties, process of compaction, and stages of tablets’ detachment and ejection. The aim of this study was to analyze the influence of the compression load, excipients’ co-processing and the addition of paracetamol on the obtained tablets’ tensile strength and the specific parameters of the tableting process, such as (net) compression work, elastic recovery, detachment, and ejection work, as well as the ejection force. Two types of neural networks were used to analyze the data: classification (Kohonen network) and regression networks (multilayer perceptron and radial basis function), to build prediction models and identify the variables that are predominantly affecting the tableting process and the obtained tablets’ tensile strength. It has been demonstrated that sophisticated data-mining methods are necessary to interpret complex phenomena regarding the effect of co-processing on tableting properties of directly compressible excipients.",
publisher = "MDPI",
journal = "Pharmaceutics",
title = "Application of machine-learning algorithms for better understanding of tableting properties of lactose co-processed with lipid excipients",
volume = "13",
number = "5",
pages = "663",
doi = "10.3390/pharmaceutics13050663"
}

Đuriš, J., Cirin-Varađan, S., Aleksić, I., Đuriš, M., Cvijić, S.,& Ibrić, S.. (2021). Application of machine-learning algorithms for better understanding of tableting properties of lactose co-processed with lipid excipients. in Pharmaceutics
MDPI., 13(5), 663.
https://doi.org/10.3390/pharmaceutics13050663

Đuriš J, Cirin-Varađan S, Aleksić I, Đuriš M, Cvijić S, Ibrić S. Application of machine-learning algorithms for better understanding of tableting properties of lactose co-processed with lipid excipients. in Pharmaceutics. 2021;13(5):663.
doi:10.3390/pharmaceutics13050663 .

Đuriš, Jelena, Cirin-Varađan, Slobodanka, Aleksić, Ivana, Đuriš, Mihal, Cvijić, Sandra, Ibrić, Svetlana, "Application of machine-learning algorithms for better understanding of tableting properties of lactose co-processed with lipid excipients" in Pharmaceutics, 13, no. 5 (2021):663,
https://doi.org/10.3390/pharmaceutics13050663 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2399
AB  - Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: Umf, εmf and Ut. Several correlations for Umf, εmf and Ut were tested and the results were compared with the experimental values. The variational model’s ability to predict the bed expansion (in the form of U=f(ε)) and the interphase drag coefficient was investigated by varying the three input variables by ±20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the εmf values. The overestimated values of εmf resulted in underestimating U(ε), and likewise, the underestimated values of εmf resulted in overestimating U(ε). The variational model’s sensitivity to changes in the Umf values is also important. Contrary to εmf, overestimating the values of Umf resulted in overestimating U(ε). The model’s least sensitivity was to the Ut value variation, which, if varied by ±20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to Umf, Ut and εmf values obtained from various correlations, in the absence of experimental values.
PB  - Taylor and Francis Inc.
T2  - Particulate Science and Technology
T1  - Sensitivity analysis of the variational model for the particulate expansion of fluidized beds
VL  - 38
IS  - 1
SP  - 95
EP  - 104
DO  - 10.1080/02726351.2018.1508100
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "Fluidization experiments were performed by using spherical and non-spherical particles to examine the sensitivity of the variational model to three input parameters: Umf, εmf and Ut. Several correlations for Umf, εmf and Ut were tested and the results were compared with the experimental values. The variational model’s ability to predict the bed expansion (in the form of U=f(ε)) and the interphase drag coefficient was investigated by varying the three input variables by ±20% compared with their experimental values. The variational model for the bed expansion showed the greatest sensitivity to changes in the εmf values. The overestimated values of εmf resulted in underestimating U(ε), and likewise, the underestimated values of εmf resulted in overestimating U(ε). The variational model’s sensitivity to changes in the Umf values is also important. Contrary to εmf, overestimating the values of Umf resulted in overestimating U(ε). The model’s least sensitivity was to the Ut value variation, which, if varied by ±20% compared with their experimental values, had a negligible effect on the prediction quality. This study aims to examine the sensitivity of the variational model to Umf, Ut and εmf values obtained from various correlations, in the absence of experimental values.",
publisher = "Taylor and Francis Inc.",
journal = "Particulate Science and Technology",
title = "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds",
volume = "38",
number = "1",
pages = "95-104",
doi = "10.1080/02726351.2018.1508100"
}

Đuriš, M., Arsenijević, Z.,& Kaluđerović-Radoičić, T.. (2020). Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology
Taylor and Francis Inc.., 38(1), 95-104.
https://doi.org/10.1080/02726351.2018.1508100

Đuriš M, Arsenijević Z, Kaluđerović-Radoičić T. Sensitivity analysis of the variational model for the particulate expansion of fluidized beds. in Particulate Science and Technology. 2020;38(1):95-104.
doi:10.1080/02726351.2018.1508100 .

Đuriš, Mihal, Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, "Sensitivity analysis of the variational model for the particulate expansion of fluidized beds" in Particulate Science and Technology, 38, no. 1 (2020):95-104,
https://doi.org/10.1080/02726351.2018.1508100 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Garić Grulović, Radmila
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3598
AB  - In this study, we applied the variational model to fluidization of small spherical particles. Fluidizationexperiments were carried out for spherical particles with 13 diameters between dp= 0.13 and 5.00 mm.We propose a generalized form of our variational model to predict the superficial velocity U and inter-phase drag coefficient ˇ by introducing an exponent n to describe the different dependences of the dragforce Fdon fluid velocity for different particle sizes (different flow regimes). By comparing the predictionswith the experimental results, we conclude that n=1 should be used for small particles (dp< 1 mm) andn = 2 for larger particles (dp> 1 mm). This conclusion is generalized by proposing n = 1 for particles withRet< 160 and n = 2 for particles with Ret> 160. The average mean absolute error was 5.49% in calculatingsuperficial velocity for different bed voidages using the modified variational model for all of the particlesexamined. The calculated values of ˇ were compared with values of literature models for particles withdp< 1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculatingˇ for different bed voidages for all of the particles examined.
PB  - Elsevier
T2  - Particuology
T1  - Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles
VL  - 51
SP  - 184
EP  - 192
DO  - 10.1016/j.partic.2019.11.002
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Garić Grulović, Radmila and Kaluđerović-Radoičić, Tatjana",
year = "2020",
abstract = "In this study, we applied the variational model to fluidization of small spherical particles. Fluidizationexperiments were carried out for spherical particles with 13 diameters between dp= 0.13 and 5.00 mm.We propose a generalized form of our variational model to predict the superficial velocity U and inter-phase drag coefficient ˇ by introducing an exponent n to describe the different dependences of the dragforce Fdon fluid velocity for different particle sizes (different flow regimes). By comparing the predictionswith the experimental results, we conclude that n=1 should be used for small particles (dp< 1 mm) andn = 2 for larger particles (dp> 1 mm). This conclusion is generalized by proposing n = 1 for particles withRet< 160 and n = 2 for particles with Ret> 160. The average mean absolute error was 5.49% in calculatingsuperficial velocity for different bed voidages using the modified variational model for all of the particlesexamined. The calculated values of ˇ were compared with values of literature models for particles withdp< 1.0 mm. The average mean absolute error of the modified variational model was 8.02% in calculatingˇ for different bed voidages for all of the particles examined.",
publisher = "Elsevier",
journal = "Particuology",
title = "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles",
volume = "51",
pages = "184-192",
doi = "10.1016/j.partic.2019.11.002"
}

Đuriš, M., Arsenijević, Z., Garić Grulović, R.,& Kaluđerović-Radoičić, T.. (2020). Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology
Elsevier., 51, 184-192.
https://doi.org/10.1016/j.partic.2019.11.002

Đuriš M, Arsenijević Z, Garić Grulović R, Kaluđerović-Radoičić T. Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles. in Particuology. 2020;51:184-192.
doi:10.1016/j.partic.2019.11.002 .

Đuriš, Mihal, Arsenijević, Zorana, Garić Grulović, Radmila, Kaluđerović-Radoičić, Tatjana, "Prediction of interphase drag coefficient and bed expansion using a variational model for fluidization of small spherical particles" in Particuology, 51 (2020):184-192,
https://doi.org/10.1016/j.partic.2019.11.002 . .

TY  - CONF
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - https://www.shd.org.rs/index.php/abstracts-56
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3293
AB  - In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution .
AB  - U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.
PB  - Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd
C3  - 56th Meeting of the Serbian chemical Society - Book of Abstracts / 56. Savetovanje Srpskog hemijskog društva - Kratki izvodi radova, Niš 7-8.9. 2019.
T1  - Investigation of the dynamics of fluidized bed granulation process
T1  - Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_cer_3293
ER  - 

@conference{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution ., U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.",
publisher = "Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd",
journal = "56th Meeting of the Serbian chemical Society - Book of Abstracts / 56. Savetovanje Srpskog hemijskog društva - Kratki izvodi radova, Niš 7-8.9. 2019.",
title = "Investigation of the dynamics of fluidized bed granulation process, Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_cer_3293"
}

Kaluđerović-Radoičić, T., Đuriš, M., Jaćimovski, D.,& Arsenijević, Z.. (2019). Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Book of Abstracts / 56. Savetovanje Srpskog hemijskog društva - Kratki izvodi radova, Niš 7-8.9. 2019.
Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd., 36.
https://hdl.handle.net/21.15107/rcub_cer_3293

Kaluđerović-Radoičić T, Đuriš M, Jaćimovski D, Arsenijević Z. Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Book of Abstracts / 56. Savetovanje Srpskog hemijskog društva - Kratki izvodi radova, Niš 7-8.9. 2019.. 2019;:36.
https://hdl.handle.net/21.15107/rcub_cer_3293 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Jaćimovski, Darko, Arsenijević, Zorana, "Investigation of the dynamics of fluidized bed granulation process" in 56th Meeting of the Serbian chemical Society - Book of Abstracts / 56. Savetovanje Srpskog hemijskog društva - Kratki izvodi radova, Niš 7-8.9. 2019. (2019):36,
https://hdl.handle.net/21.15107/rcub_cer_3293 .

TY  - CONF
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - https://www.shd.org.rs/index.php/proceedings-56
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3303
AB  - In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution .
AB  - U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.
PB  - Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd
C3  - 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.
T1  - Investigation of the dynamics of fluidized bed granulation process
T1  - Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju
SP  - 55
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_cer_3303
ER  - 

@conference{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, experimental investigation of the dynamics of the process of fluidized bed granulation was performed, in order to find optimal process conditions and binder concentration to achieve the desired granules development. The experiments were performed in batch system using corn flour as starting material. Ten experiments were performed in which sucrose solution of different concentrations (20, 30, 35 and 40 %) was used as binder. The temperature of the system was kept constant during the granulation process and amounted to 40-50°C. Samples were taken from the fluidized bed at time intervals of 3 min. The dynamics of granulation was examined by determining three different factors (bulk density, moisure content and particle size distribution) for each of the samples. It has been found that bulk density continuously decreases during the granulation process, while in the drying phase it remains constant. Particle size distribution has shown that the average diameter of the projected surface increases uniformly during the process. By comparing all of the three investigated factors, it was shown that the best quality of granules is achieved using 35 % sucrose solution ., U ovom radu izvršeno je eksperimentalno ispitivanje procesa mokre granulacije u fluidizovanom sloju u cilju pronalaženja optimalnih uslova izvođenja procesa i sastava veziva kojim će se ostvariti željena dinamika razvoja granula. Ispitivanje je izvršeno u šaržnom sistemu, a korišćeno je kukuruzno brašno kao polazni materijal. Izvršeno je 10 eksperimenata u kojima je kao vezivno sredstvo korišćen rastvor saharoze različitih koncentracija: 20, 30, 35 i 40 %. Temperatura je održavana konstantnom tokom procesa granulacije i iznosila je 40-50C. Uzorci su iz sloja uzimani u jednakim vremenskim intervalima od 3 min. Dinamika granulacije ispitivana je određivanjem tri različita faktora (nasipne gustina, vlažnosti i raspodele veličine čestica) za svaki od uzoraka. Utvrđeno je da nasipna gustina kontinualno opada tokom izvođenja procesa granulacije, dok u fazi sušenja ostaje konstantna. Raspodela veličina čestica je pokazala da srednji prečnik projektovane površine ravnomerno raste tokom procesa. Poređenjem sva tri ispitivana faktora pokazano je da se najbolji kvalitet granula postiže korišćenjem 35 % rastvora saharoze kao vezivnog sredstva.",
publisher = "Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd",
journal = "56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.",
title = "Investigation of the dynamics of fluidized bed granulation process, Ispitivanje dinamike granulacije praškastih materijala u fluidizovanom sloju",
pages = "55-59",
url = "https://hdl.handle.net/21.15107/rcub_cer_3303"
}

Kaluđerović-Radoičić, T., Đuriš, M., Jaćimovski, D.,& Arsenijević, Z.. (2019). Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.
Serbian Chemical Society, Belgrade / Srpsko hemijsko društvo, Beograd., 55-59.
https://hdl.handle.net/21.15107/rcub_cer_3303

Kaluđerović-Radoičić T, Đuriš M, Jaćimovski D, Arsenijević Z. Investigation of the dynamics of fluidized bed granulation process. in 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019.. 2019;:55-59.
https://hdl.handle.net/21.15107/rcub_cer_3303 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Jaćimovski, Darko, Arsenijević, Zorana, "Investigation of the dynamics of fluidized bed granulation process" in 56th Meeting of the Serbian chemical Society - Proceedings / 56. Savetovanje Srpskog hemijskog društva - Knjiga radova, Niš 7-8.9. 2019. (2019):55-59,
https://hdl.handle.net/21.15107/rcub_cer_3303 .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Jaćimovski, Darko
AU  - Arsenijević, Zorana
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3393
AB  - In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well.
AB  - U ovom radu je predstavljen inovativni sušionik sa fluidizovanim slojem inertnih čestica. Prikazani sistem može da se koristi za sušenje rastvora, suspenzija i pasti u cilju dobijanja praškastog produkta. Eksperimenti su rađeni na pilot postrojenju čiji je centralni deo cilindrična kolona prečnika 215 mm i visine 1200 mm. Korišćene su staklene sfere kao inertne čestice. U radu je prikazano sušenje rastvora CuSO4. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje, kao i na 
kvalitet praškastog produkta. Kvantifikovani su glavni parametri koji opisuju performanse sušionika, kao što su specifična brzina isparavanja, specifična potrošnja toplote i specifična potrošnja vazduha. Usled intenzivnog mešanja u fluidizovanom sloju postižu se približno izotermni uslovi sušenja. Izvršena je procena energetske efikasnosti sušenja. Jednostavni bilansi prenosa mase i toplote adekvatno predviđaju radni režim sistema za sušenje.
PB  - Belgrade : Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles
T1  - Visokoefikasni disperzni sušionik – Inovativni proces sušenja rastvora, suspenzija i pasti u fluidizovanom sloju inertnih čestica
VL  - 73
IS  - 4
SP  - 213
EP  - 222
DO  - 10.2298/HEMIND190626021D
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Jaćimovski, Darko and Arsenijević, Zorana",
year = "2019",
abstract = "In this paper, an innovative fluidized bed dryer with inert particles is presented. The system can be used for drying of solutions, suspensions and pastes in order to obtain a powdered product. The experiments were performed in a pilot-scale dryer with a cylindrical column 0.215 m in diameter and 1.2 mm height, with glass spheres as inert particles. The material used for drying was CuSO4 solution. The effects of operating conditions on the dryer throughput and product quality were investigated. Main performance criteria, i.e. specific water evaporation rate, specific heat consumption and specific air consumption, were quantified. Nearly isothermal conditions were found due to thorough mixing of the particles. The energy efficiency of the dryer was also assessed. Simple heat and mass balances predicted the dryer performance quite well., U ovom radu je predstavljen inovativni sušionik sa fluidizovanim slojem inertnih čestica. Prikazani sistem može da se koristi za sušenje rastvora, suspenzija i pasti u cilju dobijanja praškastog produkta. Eksperimenti su rađeni na pilot postrojenju čiji je centralni deo cilindrična kolona prečnika 215 mm i visine 1200 mm. Korišćene su staklene sfere kao inertne čestice. U radu je prikazano sušenje rastvora CuSO4. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje, kao i na 
kvalitet praškastog produkta. Kvantifikovani su glavni parametri koji opisuju performanse sušionika, kao što su specifična brzina isparavanja, specifična potrošnja toplote i specifična potrošnja vazduha. Usled intenzivnog mešanja u fluidizovanom sloju postižu se približno izotermni uslovi sušenja. Izvršena je procena energetske efikasnosti sušenja. Jednostavni bilansi prenosa mase i toplote adekvatno predviđaju radni režim sistema za sušenje.",
publisher = "Belgrade : Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles, Visokoefikasni disperzni sušionik – Inovativni proces sušenja rastvora, suspenzija i pasti u fluidizovanom sloju inertnih čestica",
volume = "73",
number = "4",
pages = "213-222",
doi = "10.2298/HEMIND190626021D"
}

Đuriš, M., Kaluđerović-Radoičić, T., Jaćimovski, D.,& Arsenijević, Z.. (2019). High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija
Belgrade : Association of Chemical Engineers of Serbia., 73(4), 213-222.
https://doi.org/10.2298/HEMIND190626021D

Đuriš M, Kaluđerović-Radoičić T, Jaćimovski D, Arsenijević Z. High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles. in Hemijska industrija. 2019;73(4):213-222.
doi:10.2298/HEMIND190626021D .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Jaćimovski, Darko, Arsenijević, Zorana, "High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles" in Hemijska industrija, 73, no. 4 (2019):213-222,
https://doi.org/10.2298/HEMIND190626021D . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Povrenović, Dragan
AU  - Kaluđerović Radoičić, Tatjana
PY  - 2019
UR  - https://izdanja.smeits.rs/index.php/procteh/article/view/6028
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4458
AB  - Waste  water  treatment  sludge  is  generated  in  increasing  
quantities,   as   the   amount   of   treated   municipal   and   
industrial  waste  water  increases.  Also,  the  requirements  
concerning the conditions of sludge storage/landfill or reuse are 
growing.  Due  to  these  reasons,  new  solutions  regarding  sludge  
treatment, management and utilization are needed [1]. The benefits 
of  drying  waste  water  treatment  sludge  can  be  seen  in  several  
aspects:  the  dried  sludge  can  be  stored  for  longer  periods  of  time  
and  further  used  as  an  organic  fertilizer,  it  can  be  a  source  of  
useful  (active)  microorganisms  that  can  be  reused  in  waste  water  
treatment.  Drying  also  enables  incineration  or  co-incineration  of  
sludge.  Sludge  drying  process  reduces  mass  and  volume  of  the  
product, making its storage, transport, packaging and retail easier 
[2-4].
AB  - Sušenjem mulja iz procesa prečišćavanja otpadnih voda mogu se dobiti dva glavna upotrebljiva proizvoda: osušeni mulj može se skladištiti i koristiti kao organsko đubrivo, a može sadržati i aktivne (žive) mikroorganizme koji se ponovo mogu koristiti u tretmanu otpadnih voda. Sušenje suspenzija i pasta u fluidizovanom sloju inertnih čestica predstavlja atraktivnu alternativu ostalim postupcima sušenja u pogledu osnovnih kriterijuma za ocenu efikasnosti kao što su specifični kapacitet isparavanja, specifični utrošak toplote i specifični utrošak vazduha. Visoka efikasnost sušenja je rezultat velikih kontaktnih površina i velikih temperaturnih razlika između ulaznog i izlaznog toka vazduha za sušenje. Intenzivno mešanje inertnih čestica tokom agregativne fluidizacije obezbeđuje približno jednaku temperaturu u celoj zapremini sloja te ne postoji rizik od lokalnog pregrevanja. U radu su prikazani rezultati ispitivanja sušenja mulja na pilot postrojenju za sušenje suspenzija i pasta nominalnog kapaciteta isparavanja do20 kgH2O/h, čiji je centralni deo cilindrična kolona prečnika 215 mm sa fluidizovanim slojem staklenih sfera. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje i na kvalitet praškastog osušenog aktivnog mulja. Glavni cilj je da se odrede optimalne temperature sušenja mulja pri kojima bi korisni mikroorganizmu u mulju ostali aktivni (živi), a pri kojim aktivni mulj može da se koristi kao oragansko đubrivo. Izvršena je analiza efikasnosti sušenja sa stanovišta kapaciteta isparavanja i potrošnje vazduha u cilju boljeg sagledavanja performansi sistema za sušenje. Jednostavni bilansi mase i toplote adekvatno predviđaju radni režim sistema za sušenje u fluidizovanom sloju inertnog materijala.
PB  - Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS
T2  - Procesna tehnika
T1  - Drying of waste water treatment sludge in fluidized bed of inert particles
T1  - Sušenje mulja iz procesa prečišćavanja otpadnih voda u fluidizovanom sloju inertnih čestica
VL  - 31
IS  - 2
SP  - 14
EP  - 18
DO  - 10.24094/ptc.019.31.2.14
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Povrenović, Dragan and Kaluđerović Radoičić, Tatjana",
year = "2019",
abstract = "Waste  water  treatment  sludge  is  generated  in  increasing  
quantities,   as   the   amount   of   treated   municipal   and   
industrial  waste  water  increases.  Also,  the  requirements  
concerning the conditions of sludge storage/landfill or reuse are 
growing.  Due  to  these  reasons,  new  solutions  regarding  sludge  
treatment, management and utilization are needed [1]. The benefits 
of  drying  waste  water  treatment  sludge  can  be  seen  in  several  
aspects:  the  dried  sludge  can  be  stored  for  longer  periods  of  time  
and  further  used  as  an  organic  fertilizer,  it  can  be  a  source  of  
useful  (active)  microorganisms  that  can  be  reused  in  waste  water  
treatment.  Drying  also  enables  incineration  or  co-incineration  of  
sludge.  Sludge  drying  process  reduces  mass  and  volume  of  the  
product, making its storage, transport, packaging and retail easier 
[2-4]., Sušenjem mulja iz procesa prečišćavanja otpadnih voda mogu se dobiti dva glavna upotrebljiva proizvoda: osušeni mulj može se skladištiti i koristiti kao organsko đubrivo, a može sadržati i aktivne (žive) mikroorganizme koji se ponovo mogu koristiti u tretmanu otpadnih voda. Sušenje suspenzija i pasta u fluidizovanom sloju inertnih čestica predstavlja atraktivnu alternativu ostalim postupcima sušenja u pogledu osnovnih kriterijuma za ocenu efikasnosti kao što su specifični kapacitet isparavanja, specifični utrošak toplote i specifični utrošak vazduha. Visoka efikasnost sušenja je rezultat velikih kontaktnih površina i velikih temperaturnih razlika između ulaznog i izlaznog toka vazduha za sušenje. Intenzivno mešanje inertnih čestica tokom agregativne fluidizacije obezbeđuje približno jednaku temperaturu u celoj zapremini sloja te ne postoji rizik od lokalnog pregrevanja. U radu su prikazani rezultati ispitivanja sušenja mulja na pilot postrojenju za sušenje suspenzija i pasta nominalnog kapaciteta isparavanja do20 kgH2O/h, čiji je centralni deo cilindrična kolona prečnika 215 mm sa fluidizovanim slojem staklenih sfera. Ispitivan je uticaj operativnih uslova na performanse sistema za sušenje i na kvalitet praškastog osušenog aktivnog mulja. Glavni cilj je da se odrede optimalne temperature sušenja mulja pri kojima bi korisni mikroorganizmu u mulju ostali aktivni (živi), a pri kojim aktivni mulj može da se koristi kao oragansko đubrivo. Izvršena je analiza efikasnosti sušenja sa stanovišta kapaciteta isparavanja i potrošnje vazduha u cilju boljeg sagledavanja performansi sistema za sušenje. Jednostavni bilansi mase i toplote adekvatno predviđaju radni režim sistema za sušenje u fluidizovanom sloju inertnog materijala.",
publisher = "Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS",
journal = "Procesna tehnika",
title = "Drying of waste water treatment sludge in fluidized bed of inert particles, Sušenje mulja iz procesa prečišćavanja otpadnih voda u fluidizovanom sloju inertnih čestica",
volume = "31",
number = "2",
pages = "14-18",
doi = "10.24094/ptc.019.31.2.14"
}

Đuriš, M., Arsenijević, Z., Povrenović, D.,& Kaluđerović Radoičić, T.. (2019). Drying of waste water treatment sludge in fluidized bed of inert particles. in Procesna tehnika
Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS., 31(2), 14-18.
https://doi.org/10.24094/ptc.019.31.2.14

Đuriš M, Arsenijević Z, Povrenović D, Kaluđerović Radoičić T. Drying of waste water treatment sludge in fluidized bed of inert particles. in Procesna tehnika. 2019;31(2):14-18.
doi:10.24094/ptc.019.31.2.14 .

Đuriš, Mihal, Arsenijević, Zorana, Povrenović, Dragan, Kaluđerović Radoičić, Tatjana, "Drying of waste water treatment sludge in fluidized bed of inert particles" in Procesna tehnika, 31, no. 2 (2019):14-18,
https://doi.org/10.24094/ptc.019.31.2.14 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Garić Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2245
AB  - The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Friction factor for water flow through packed beds of spherical and non-spherical particles
VL  - 23
IS  - 1
SP  - 57
EP  - 66
DO  - 10.2298/CICEQ150506006K
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Garić Grulović, Radmila and Đuriš, Mihal and Grbavčić, Željko",
year = "2017",
abstract = "The aim of this work was the experimental evaluation of different friction factor correlations for water flow through packed beds of spherical and non-spherical particles at ambient temperature. The experiments were performed by measuring the pressure drop across the bed. Packed beds made of monosized glass spherical particles of seven different diameters were used, as well as beds made of 16 fractions of quartz filtration sand obtained by sieving (polydisperse non-spherical particles). The range of bed voidages was 0.359-0.486, while the range of bed particle Reynolds numbers was from 0.3 to 286 for spherical particles and from 0.1 to 50 for non-spherical particles. The obtained results were compared using a number of available literature correlations. In order to improve the correlation results for spherical particles, a new simple equation was proposed in the form of Ergun's equation, with modified coefficients. The new correlation had a mean absolute deviation between experimental and calculated values of pressure drop of 9.04%. For non-spherical quartz filtration sand particles the best fit was obtained using Ergun's equation, with a mean absolute deviation of 10.36%. Surface-volume diameter (dsv) necessary for correlating the data for filtration sand particles was calculated based on correlations for d(v) = f(d(m)) and psi = f(d(m)).",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Friction factor for water flow through packed beds of spherical and non-spherical particles",
volume = "23",
number = "1",
pages = "57-66",
doi = "10.2298/CICEQ150506006K"
}

Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Garić Grulović, R., Đuriš, M.,& Grbavčić, Ž.. (2017). Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 23(1), 57-66.
https://doi.org/10.2298/CICEQ150506006K

Kaluđerović-Radoičić T, Bošković-Vragolović N, Garić Grulović R, Đuriš M, Grbavčić Ž. Friction factor for water flow through packed beds of spherical and non-spherical particles. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2017;23(1):57-66.
doi:10.2298/CICEQ150506006K .

Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Garić Grulović, Radmila, Đuriš, Mihal, Grbavčić, Željko, "Friction factor for water flow through packed beds of spherical and non-spherical particles" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 23, no. 1 (2017):57-66,
https://doi.org/10.2298/CICEQ150506006K . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Arsenijević, Zorana
AU  - Jaćimovski, Darko
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1899
AB  - In this paper, the influence of different scanning resolutions and the use of image analysis softwares for the image analysis, SigmaScan Pro, Image) and Matlab, on size and shape factors commonly used in particles characterization were investigated. In our previous paper [1] the characterization of polydisperse sand particles was performed, and the need had arisen to examine the impact of different scanning resolutions on shape factors in more detail. The particles analyzed were the polydisperse fractions of quartz filtration sand with sieve diameters in the intervals of 0.85-1.030 mm, 1.406-1.600 mm and 2.00-2.83 mm. The particles size and shape were analyzed using the scanned image of about 150 particles in each fraction. In addition, the images of circles of similar dimensions were generated to serve as reference particles. The scanning resolutions used in this study were from 75 to 4800 dpi, and grayscale thresholds were optimized for discrimination of the particles from the background. The obtained results indicate that the resolution (i.e. the pixel size) and the algorithms used in image analysis softwares have significant influence on the obtained shape factors. The most significant effect was observed in the calculated values of the particles perimeters, while the effect was less pronounced in the results obtained for the particles projected area. The analysis of images of generated circles confirmed that the resolution had the largest effect on particle perimeter. The use of the resolutions of 300-600 dpi for the determination of particle shape and size can be recommended for particles of similar to 1 mm and larger, because of reasonable results, low storage space and less time for image analysis.
PB  - Elsevier
T2  - Powder Technology
T1  - Optimal pixel resolution for sand particles size and shape analysis
VL  - 302
SP  - 177
EP  - 186
DO  - 10.1016/j.powtec.2016.08.045
ER  - 

@article{
author = "Đuriš, Mihal and Arsenijević, Zorana and Jaćimovski, Darko and Kaluđerović-Radoičić, Tatjana",
year = "2016",
abstract = "In this paper, the influence of different scanning resolutions and the use of image analysis softwares for the image analysis, SigmaScan Pro, Image) and Matlab, on size and shape factors commonly used in particles characterization were investigated. In our previous paper [1] the characterization of polydisperse sand particles was performed, and the need had arisen to examine the impact of different scanning resolutions on shape factors in more detail. The particles analyzed were the polydisperse fractions of quartz filtration sand with sieve diameters in the intervals of 0.85-1.030 mm, 1.406-1.600 mm and 2.00-2.83 mm. The particles size and shape were analyzed using the scanned image of about 150 particles in each fraction. In addition, the images of circles of similar dimensions were generated to serve as reference particles. The scanning resolutions used in this study were from 75 to 4800 dpi, and grayscale thresholds were optimized for discrimination of the particles from the background. The obtained results indicate that the resolution (i.e. the pixel size) and the algorithms used in image analysis softwares have significant influence on the obtained shape factors. The most significant effect was observed in the calculated values of the particles perimeters, while the effect was less pronounced in the results obtained for the particles projected area. The analysis of images of generated circles confirmed that the resolution had the largest effect on particle perimeter. The use of the resolutions of 300-600 dpi for the determination of particle shape and size can be recommended for particles of similar to 1 mm and larger, because of reasonable results, low storage space and less time for image analysis.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Optimal pixel resolution for sand particles size and shape analysis",
volume = "302",
pages = "177-186",
doi = "10.1016/j.powtec.2016.08.045"
}

Đuriš, M., Arsenijević, Z., Jaćimovski, D.,& Kaluđerović-Radoičić, T.. (2016). Optimal pixel resolution for sand particles size and shape analysis. in Powder Technology
Elsevier., 302, 177-186.
https://doi.org/10.1016/j.powtec.2016.08.045

Đuriš M, Arsenijević Z, Jaćimovski D, Kaluđerović-Radoičić T. Optimal pixel resolution for sand particles size and shape analysis. in Powder Technology. 2016;302:177-186.
doi:10.1016/j.powtec.2016.08.045 .

Đuriš, Mihal, Arsenijević, Zorana, Jaćimovski, Darko, Kaluđerović-Radoičić, Tatjana, "Optimal pixel resolution for sand particles size and shape analysis" in Powder Technology, 302 (2016):177-186,
https://doi.org/10.1016/j.powtec.2016.08.045 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Arsenijević, Zorana
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1945
AB  - In this paper, the minimum fluidization velocity and bed expansion of polydisperse sand mixtures fluidized with water were investigated. The fluidization experiments were carried out using 19 different fractions of quartz filtration sand with sieve diameters in the interval d(m) = 0.359 to 2.596 mm. The intercept fluid velocity U-E was determined from the plot of fluid superficial velocity vs. porosity. The results obtained indicated that U-E was about 11% higher than particle terminal velocity U-t, for all of the sand fractions investigated. Based on the experimental data, the new model for bed expansion of quartz filtration sand was proposed. Using the proposed model, the mean absolute deviation in predicting the bed porosity epsilon, for a given superficial velocity U, was 2.66%, while the mean absolute deviation in predicting U at a given epsilon was 8.75%. For the prediction of the minimum fluidization velocity, U-mf, several literature models were tested. The best results were obtained using the Ergun model, with mean absolute deviation in predicting U-mf of 12.42%. A new simple correlation for the prediction of the minimum fluidization velocity U-mf was proposed. The proposed correlation is the function only of the mean sieve diameter of the filtration sand fraction. The mean absolute deviation between the experimental and the predicted values of U-mf was 7.65%.
PB  - Elsevier
T2  - Powder Technology
T1  - Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water
VL  - 289
SP  - 95
EP  - 103
DO  - 10.1016/j.powtec.2015.11.047
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Arsenijević, Zorana and Garić Grulović, Radmila and Grbavčić, Željko",
year = "2016",
abstract = "In this paper, the minimum fluidization velocity and bed expansion of polydisperse sand mixtures fluidized with water were investigated. The fluidization experiments were carried out using 19 different fractions of quartz filtration sand with sieve diameters in the interval d(m) = 0.359 to 2.596 mm. The intercept fluid velocity U-E was determined from the plot of fluid superficial velocity vs. porosity. The results obtained indicated that U-E was about 11% higher than particle terminal velocity U-t, for all of the sand fractions investigated. Based on the experimental data, the new model for bed expansion of quartz filtration sand was proposed. Using the proposed model, the mean absolute deviation in predicting the bed porosity epsilon, for a given superficial velocity U, was 2.66%, while the mean absolute deviation in predicting U at a given epsilon was 8.75%. For the prediction of the minimum fluidization velocity, U-mf, several literature models were tested. The best results were obtained using the Ergun model, with mean absolute deviation in predicting U-mf of 12.42%. A new simple correlation for the prediction of the minimum fluidization velocity U-mf was proposed. The proposed correlation is the function only of the mean sieve diameter of the filtration sand fraction. The mean absolute deviation between the experimental and the predicted values of U-mf was 7.65%.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water",
volume = "289",
pages = "95-103",
doi = "10.1016/j.powtec.2015.11.047"
}

Đuriš, M., Kaluđerović-Radoičić, T., Arsenijević, Z., Garić Grulović, R.,& Grbavčić, Ž.. (2016). Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water. in Powder Technology
Elsevier., 289, 95-103.
https://doi.org/10.1016/j.powtec.2015.11.047

Đuriš M, Kaluđerović-Radoičić T, Arsenijević Z, Garić Grulović R, Grbavčić Ž. Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water. in Powder Technology. 2016;289:95-103.
doi:10.1016/j.powtec.2015.11.047 .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Arsenijević, Zorana, Garić Grulović, Radmila, Grbavčić, Željko, "Prediction of bed expansion of polydisperse quartz sand mixtures fluidized with water" in Powder Technology, 289 (2016):95-103,
https://doi.org/10.1016/j.powtec.2015.11.047 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1696
AB  - A three-phase (gas-liquid-solid) fluidized bed was used to study the heat transfer characteristics of a system consisting of low-density (290 kg/m(3)) spherical particles (2 cm diameter) in a 0.25 m cylindrical column with counter-current flow of water and air. The experimental investigation and mathematical modeling of heat transfer between the hot air and the cooling water was carried out. The experiments were conducted for a variety of different fluid flow rates and inlet air temperatures, while the air flow rate was kept constant. Based on the obtained experimental results, a new correlation for heat transfer in a three-phase fluidized system was proposed. The mean percentage error between the experimental and the correlated values of the j(Hp) obtained was 1.69%. The hydrodynamic parameters of the system were also calculated according to the available literature correlations.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Experimental investigation of heat transfer in three-phase fluidized bed cooling column
VL  - 21
IS  - 4
SP  - 519
EP  - 526
DO  - 10.2298/CICEQ141022008A
ER  - 

@article{
author = "Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Grbavčić, Željko",
year = "2015",
abstract = "A three-phase (gas-liquid-solid) fluidized bed was used to study the heat transfer characteristics of a system consisting of low-density (290 kg/m(3)) spherical particles (2 cm diameter) in a 0.25 m cylindrical column with counter-current flow of water and air. The experimental investigation and mathematical modeling of heat transfer between the hot air and the cooling water was carried out. The experiments were conducted for a variety of different fluid flow rates and inlet air temperatures, while the air flow rate was kept constant. Based on the obtained experimental results, a new correlation for heat transfer in a three-phase fluidized system was proposed. The mean percentage error between the experimental and the correlated values of the j(Hp) obtained was 1.69%. The hydrodynamic parameters of the system were also calculated according to the available literature correlations.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Experimental investigation of heat transfer in three-phase fluidized bed cooling column",
volume = "21",
number = "4",
pages = "519-526",
doi = "10.2298/CICEQ141022008A"
}

Arsenijević, Z., Kaluđerović-Radoičić, T., Đuriš, M.,& Grbavčić, Ž.. (2015). Experimental investigation of heat transfer in three-phase fluidized bed cooling column. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 21(4), 519-526.
https://doi.org/10.2298/CICEQ141022008A

Arsenijević Z, Kaluđerović-Radoičić T, Đuriš M, Grbavčić Ž. Experimental investigation of heat transfer in three-phase fluidized bed cooling column. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2015;21(4):519-526.
doi:10.2298/CICEQ141022008A .

Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Grbavčić, Željko, "Experimental investigation of heat transfer in three-phase fluidized bed cooling column" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 21, no. 4 (2015):519-526,
https://doi.org/10.2298/CICEQ141022008A . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Đuriš, Mihal
AU  - Bošković-Vragolović, Nevenka
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1465
AB  - Wall-to-bed momentum, heat and mass transfer in the vertical liquid-solids flow, as well as in the single phase flow, were studied. The aim of this investigation was to establish the analogy among those phenomena. Also, effect of particle concentration on momentum, heat and mass transfer was studied. The experiments in hydraulic transport were performed in 25.4 mm I.D. cooper tube equipped with a steam jacket, using spherical glass particles of 1.94 mm in diameter and water as a transport fluid. The segment of the transport tube used for mass transfer measurements had internal coating made of benzoic acid. In the hydraulic transport two characteristic flow regimes were observed: turbulent and parallel particle flow regime. The transition between two characteristic regimes (Y* = 0), occurs at a critical voidage ε ≈ 0.85. The vertical two-phase flow was con­sidered as the pseudofluid, and modified mixture-wall friction coefficient (fw) and modified mixture Reynolds number (Rem) were introduced for system characterization. Experimental data show that the wall-to-bed momentum, heat and mass transfer coefficients, in vertical flow of pseudofluid, for the turbulent regime are significantly higher than in parallel regime. Wall-to-bed, mass and heat transfer coefficients in hydraulic transport of particles were much higher than in single-phase flow for lower Reynolds numbers (Re  LT  15000), while for high Reynolds numbers (Re > 15000), there was not significant difference. The experimental data for wall-to-bed momentum, heat and mass transfer in vertical flow of pseudofluid in parallel particle flow regime, verify analogy among these three phenomena.
AB  - U ovom radu prikazani su rezultati eksperimentalnih ispitivanja prenosa količine kretanja, toplote i mase zid-fluid u vertikalnom hidrauličkom transportu inertnih čestica i pri strujanju fluida u cevi istog prečnika. Eksperimentalna ispitivanja vršena su istovremenim merenjem potrebnih parametara za definisanje navedenih prenosa. Cilj ovih ispitivanja bio je određivanje koeficijenata prenosa pri vertikalnom hidrauličkom transportu inertnih čestica i uspostavljanje analogije tri prenosa. Eksperimentalni sistem predstavljala je vertikalna transportna cev prečnika 25,4 mm snabdevena omotačem za zagrevanje parom, kao i segmentom transportne cevi prepariranim rastopom benzoeve kiseline. Kao fluid korišćena je voda, a vršen je transport staklenih sfernih čestica prečnika 1,94 mm. U rezultatima su prikazani dobijeni koeficijenti trenja, prelaza toplote i prelaza mase. Korišćenjem koncepta pseudofluida, pokazano je postojanje analogije prenosa količine kretanja, toplote i mase u transportnoj cevi za paralelni režim strujanja.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles
T1  - Analogija prenosa količine kretanja, toplote i mase pri vertikalnom hidrauličkom transportu inertnih čestica
VL  - 68
IS  - 1
SP  - 15
EP  - 25
DO  - 10.2298/HEMIND130207025J
ER  - 

@article{
author = "Jaćimovski, Darko and Garić Grulović, Radmila and Grbavčić, Željko and Đuriš, Mihal and Bošković-Vragolović, Nevenka",
year = "2014",
abstract = "Wall-to-bed momentum, heat and mass transfer in the vertical liquid-solids flow, as well as in the single phase flow, were studied. The aim of this investigation was to establish the analogy among those phenomena. Also, effect of particle concentration on momentum, heat and mass transfer was studied. The experiments in hydraulic transport were performed in 25.4 mm I.D. cooper tube equipped with a steam jacket, using spherical glass particles of 1.94 mm in diameter and water as a transport fluid. The segment of the transport tube used for mass transfer measurements had internal coating made of benzoic acid. In the hydraulic transport two characteristic flow regimes were observed: turbulent and parallel particle flow regime. The transition between two characteristic regimes (Y* = 0), occurs at a critical voidage ε ≈ 0.85. The vertical two-phase flow was con­sidered as the pseudofluid, and modified mixture-wall friction coefficient (fw) and modified mixture Reynolds number (Rem) were introduced for system characterization. Experimental data show that the wall-to-bed momentum, heat and mass transfer coefficients, in vertical flow of pseudofluid, for the turbulent regime are significantly higher than in parallel regime. Wall-to-bed, mass and heat transfer coefficients in hydraulic transport of particles were much higher than in single-phase flow for lower Reynolds numbers (Re  LT  15000), while for high Reynolds numbers (Re > 15000), there was not significant difference. The experimental data for wall-to-bed momentum, heat and mass transfer in vertical flow of pseudofluid in parallel particle flow regime, verify analogy among these three phenomena., U ovom radu prikazani su rezultati eksperimentalnih ispitivanja prenosa količine kretanja, toplote i mase zid-fluid u vertikalnom hidrauličkom transportu inertnih čestica i pri strujanju fluida u cevi istog prečnika. Eksperimentalna ispitivanja vršena su istovremenim merenjem potrebnih parametara za definisanje navedenih prenosa. Cilj ovih ispitivanja bio je određivanje koeficijenata prenosa pri vertikalnom hidrauličkom transportu inertnih čestica i uspostavljanje analogije tri prenosa. Eksperimentalni sistem predstavljala je vertikalna transportna cev prečnika 25,4 mm snabdevena omotačem za zagrevanje parom, kao i segmentom transportne cevi prepariranim rastopom benzoeve kiseline. Kao fluid korišćena je voda, a vršen je transport staklenih sfernih čestica prečnika 1,94 mm. U rezultatima su prikazani dobijeni koeficijenti trenja, prelaza toplote i prelaza mase. Korišćenjem koncepta pseudofluida, pokazano je postojanje analogije prenosa količine kretanja, toplote i mase u transportnoj cevi za paralelni režim strujanja.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles, Analogija prenosa količine kretanja, toplote i mase pri vertikalnom hidrauličkom transportu inertnih čestica",
volume = "68",
number = "1",
pages = "15-25",
doi = "10.2298/HEMIND130207025J"
}

Jaćimovski, D., Garić Grulović, R., Grbavčić, Ž., Đuriš, M.,& Bošković-Vragolović, N.. (2014). Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles. in Hemijska industrija
Association of Chemical Engineers of Serbia., 68(1), 15-25.
https://doi.org/10.2298/HEMIND130207025J

Jaćimovski D, Garić Grulović R, Grbavčić Ž, Đuriš M, Bošković-Vragolović N. Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles. in Hemijska industrija. 2014;68(1):15-25.
doi:10.2298/HEMIND130207025J .

Jaćimovski, Darko, Garić Grulović, Radmila, Grbavčić, Željko, Đuriš, Mihal, Bošković-Vragolović, Nevenka, "Momentum, heat, and mass transfer analogy for vertical hydraulic transport of inert particles" in Hemijska industrija, 68, no. 1 (2014):15-25,
https://doi.org/10.2298/HEMIND130207025J . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Garić Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1500
AB  - The equations for the overall particle circulation rate and the frequency of particle-particle collisions in the quasi two-dimenional water-fluidized bed were proposed. The equations were based on the experimental results obtained from the water fluidized beds of mono-sized spherical glass particles d(p) = 1.94, 2.98,4.00 and 6.00 mm in diameter and the correlation for the mean particle speed from our previous paper [14] The optimal porosity of the fluidized bed was defined as the porosity at which the overall circulation rate or the frequency of collisions shows their maximum. The optimal porosities were calcylated from the derivatives of the proposed correlations. The calculated optimal porosity was in the range 0.68-0.72 for the overall circulation rate, and 0.59-0.64 for the frequency of particle-particle collisions. The results obtained are in accordance with the experimental findings from the literature [2,3,23] which show that the maximum values of the heat and mass transport coefficients in the liquid fluidized beds are reached in the range of porosities between 0.6 and 0.8. By visual observations of the monolayer fluidized bed of spherical particles 10 mm in diameter we concluded that the collisions in the liquid fluidized beds in most cases are not pairwise, but that the particles which collide often move together for some time in agglomerates before separating. The majority of collisions in fluidized beds differ very much from the instantaneous collisions as regarded in the kinetic theory of gases. Therefore, the overall circulation rate is a better measure of the dynamics of the fluidized bed and the intensity of transport properties than the frequency of collisions.
PB  - Elsevier
T2  - Powder Technology
T1  - Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles
VL  - 253
SP  - 295
EP  - 303
DO  - 10.1016/j.powtec.2013.11.038
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Garić Grulović, Radmila and Arsenijević, Zorana and Grbavčić, Željko",
year = "2014",
abstract = "The equations for the overall particle circulation rate and the frequency of particle-particle collisions in the quasi two-dimenional water-fluidized bed were proposed. The equations were based on the experimental results obtained from the water fluidized beds of mono-sized spherical glass particles d(p) = 1.94, 2.98,4.00 and 6.00 mm in diameter and the correlation for the mean particle speed from our previous paper [14] The optimal porosity of the fluidized bed was defined as the porosity at which the overall circulation rate or the frequency of collisions shows their maximum. The optimal porosities were calcylated from the derivatives of the proposed correlations. The calculated optimal porosity was in the range 0.68-0.72 for the overall circulation rate, and 0.59-0.64 for the frequency of particle-particle collisions. The results obtained are in accordance with the experimental findings from the literature [2,3,23] which show that the maximum values of the heat and mass transport coefficients in the liquid fluidized beds are reached in the range of porosities between 0.6 and 0.8. By visual observations of the monolayer fluidized bed of spherical particles 10 mm in diameter we concluded that the collisions in the liquid fluidized beds in most cases are not pairwise, but that the particles which collide often move together for some time in agglomerates before separating. The majority of collisions in fluidized beds differ very much from the instantaneous collisions as regarded in the kinetic theory of gases. Therefore, the overall circulation rate is a better measure of the dynamics of the fluidized bed and the intensity of transport properties than the frequency of collisions.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles",
volume = "253",
pages = "295-303",
doi = "10.1016/j.powtec.2013.11.038"
}

Kaluđerović-Radoičić, T., Đuriš, M., Garić Grulović, R., Arsenijević, Z.,& Grbavčić, Ž.. (2014). Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles. in Powder Technology
Elsevier., 253, 295-303.
https://doi.org/10.1016/j.powtec.2013.11.038

Kaluđerović-Radoičić T, Đuriš M, Garić Grulović R, Arsenijević Z, Grbavčić Ž. Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles. in Powder Technology. 2014;253:295-303.
doi:10.1016/j.powtec.2013.11.038 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Garić Grulović, Radmila, Arsenijević, Zorana, Grbavčić, Željko, "Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles" in Powder Technology, 253 (2014):295-303,
https://doi.org/10.1016/j.powtec.2013.11.038 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Garić Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1507
AB  - The one-dimensional model of accelerating turbulent downward co-current gas-solid flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. The experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solid mass flux of 392.8 kg/m(2) s. Tube Reynolds number ranged from 880 to 11,300 and the slip Reynolds number from 32 to 670. At these conditions, the loading ratio G(p)/G(f) was in the range from 395 to 31. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The results measured at a distance of 1.51 m from the transport tube inlet show that the particle velocity and the mean voidage increase with the increase in superficial gas velocity. The slip velocity changes from negative values at low gas superficial velocities to positive values at high gas superficial velocities. The same trend was observed for the change of the pressure gradient in the system. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. The distance from the transport tube inlet at which the slip velocity changes its sign from positive to negative is the function of the gas superficial velocity. At positive slip velocity both gravity and drag contribute to particle acceleration. At negative slip velocity the drag force acts in upward direction resisting the particle acceleration. In downward co-current gas-solid flow acceleration length is relatively long, about two times longer compared to the upward co-current gas-solid flow.
PB  - Elsevier
T2  - Powder Technology
T1  - Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow
VL  - 256
SP  - 416
EP  - 427
DO  - 10.1016/j.powtec.2014.01.091
ER  - 

@article{
author = "Arsenijević, Zorana and Kaluđerović-Radoičić, Tatjana and Garić Grulović, Radmila and Đuriš, Mihal and Grbavčić, Željko",
year = "2014",
abstract = "The one-dimensional model of accelerating turbulent downward co-current gas-solid flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. The experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solid mass flux of 392.8 kg/m(2) s. Tube Reynolds number ranged from 880 to 11,300 and the slip Reynolds number from 32 to 670. At these conditions, the loading ratio G(p)/G(f) was in the range from 395 to 31. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The results measured at a distance of 1.51 m from the transport tube inlet show that the particle velocity and the mean voidage increase with the increase in superficial gas velocity. The slip velocity changes from negative values at low gas superficial velocities to positive values at high gas superficial velocities. The same trend was observed for the change of the pressure gradient in the system. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. The distance from the transport tube inlet at which the slip velocity changes its sign from positive to negative is the function of the gas superficial velocity. At positive slip velocity both gravity and drag contribute to particle acceleration. At negative slip velocity the drag force acts in upward direction resisting the particle acceleration. In downward co-current gas-solid flow acceleration length is relatively long, about two times longer compared to the upward co-current gas-solid flow.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow",
volume = "256",
pages = "416-427",
doi = "10.1016/j.powtec.2014.01.091"
}

Arsenijević, Z., Kaluđerović-Radoičić, T., Garić Grulović, R., Đuriš, M.,& Grbavčić, Ž.. (2014). Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow. in Powder Technology
Elsevier., 256, 416-427.
https://doi.org/10.1016/j.powtec.2014.01.091

Arsenijević Z, Kaluđerović-Radoičić T, Garić Grulović R, Đuriš M, Grbavčić Ž. Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow. in Powder Technology. 2014;256:416-427.
doi:10.1016/j.powtec.2014.01.091 .

Arsenijević, Zorana, Kaluđerović-Radoičić, Tatjana, Garić Grulović, Radmila, Đuriš, Mihal, Grbavčić, Željko, "Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow" in Powder Technology, 256 (2014):416-427,
https://doi.org/10.1016/j.powtec.2014.01.091 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Garić Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1513
AB  - In this paper, different methods for particle characterization were applied to 16 polydisperse fractions of quartz filtration sand obtained by sieving, with sieve diameters in the interval d(m) = 0359 to 2.415. For each fraction, volume diameter was measured and projected diameter and 2D shape factor were obtained using the scanned image of the projection of a large number of particles. The correlations between the volume diameter, projected diameter and 2D shape factor with sieve diameter were proposed. All of the correlations show linear dependence between the variables. The sphericity was determined for the fractions from packed-bed pressure drop measurements; from terminal velocity measurements using different correlations for the calculation of C-D, direct correlations for U-t and from direct empirical correlations. The sphericities obtained using different methods and correlations gave very different results. Both the sphericity and the 2D shape factor were shown to decrease with increase in particle sieve diameter.
PB  - Elsevier
T2  - Powder Technology
T1  - Particle characterization of polydisperse quartz filtration sand
VL  - 254
SP  - 63
EP  - 71
DO  - 10.1016/j.powtec.2014.01.003
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Đuriš, Mihal and Garić Grulović, Radmila and Arsenijević, Zorana and Grbavčić, Željko",
year = "2014",
abstract = "In this paper, different methods for particle characterization were applied to 16 polydisperse fractions of quartz filtration sand obtained by sieving, with sieve diameters in the interval d(m) = 0359 to 2.415. For each fraction, volume diameter was measured and projected diameter and 2D shape factor were obtained using the scanned image of the projection of a large number of particles. The correlations between the volume diameter, projected diameter and 2D shape factor with sieve diameter were proposed. All of the correlations show linear dependence between the variables. The sphericity was determined for the fractions from packed-bed pressure drop measurements; from terminal velocity measurements using different correlations for the calculation of C-D, direct correlations for U-t and from direct empirical correlations. The sphericities obtained using different methods and correlations gave very different results. Both the sphericity and the 2D shape factor were shown to decrease with increase in particle sieve diameter.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Particle characterization of polydisperse quartz filtration sand",
volume = "254",
pages = "63-71",
doi = "10.1016/j.powtec.2014.01.003"
}

Kaluđerović-Radoičić, T., Đuriš, M., Garić Grulović, R., Arsenijević, Z.,& Grbavčić, Ž.. (2014). Particle characterization of polydisperse quartz filtration sand. in Powder Technology
Elsevier., 254, 63-71.
https://doi.org/10.1016/j.powtec.2014.01.003

Kaluđerović-Radoičić T, Đuriš M, Garić Grulović R, Arsenijević Z, Grbavčić Ž. Particle characterization of polydisperse quartz filtration sand. in Powder Technology. 2014;254:63-71.
doi:10.1016/j.powtec.2014.01.003 .

Kaluđerović-Radoičić, Tatjana, Đuriš, Mihal, Garić Grulović, Radmila, Arsenijević, Zorana, Grbavčić, Željko, "Particle characterization of polydisperse quartz filtration sand" in Powder Technology, 254 (2014):63-71,
https://doi.org/10.1016/j.powtec.2014.01.003 . .

TY  - JOUR
AU  - Garić Grulović, Radmila
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Arsenijević, Zorana
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1520
AB  - The one-dimensional model of accelerating turbulent downward counter-current gas-solids flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. Experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solids mass flux of 392.8 kg/m(2)s. Tube Reynolds number ranged from 170 to 5300 and the slip Reynolds number from 650 to 1060. Under these conditions loading ratio (G(p)/G(f)) varied between 66 and 2089. Visual observations show that particles flow downward in apparently homogenous dispersion. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The mean voidage and the particle velocity decrease, while the slip velocity increases with the increase in gas superficial velocity. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. In these calculations, particle-wall friction coefficient was determined indirectly by adjusting the f(p) value to agree with the experimental data. The effect of the value of fp on the model calculations was significant. Calculations show that the acceleration length for the same particles (1.94 mm) in downward counter-current gas-solids flow is about two times higher than the acceleration length in upward co-current gas-solids flow. In the system investigated, "choking" occurs at slip velocity which is about 73% of the single particle terminal velocity.
PB  - Elsevier
T2  - Powder Technology
T1  - Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow
VL  - 256
SP  - 404
EP  - 415
DO  - 10.1016/j.powtec.2014.01.090
ER  - 

@article{
author = "Garić Grulović, Radmila and Kaluđerović-Radoičić, Tatjana and Arsenijević, Zorana and Đuriš, Mihal and Grbavčić, Željko",
year = "2014",
abstract = "The one-dimensional model of accelerating turbulent downward counter-current gas-solids flow of coarse particles was formulated and experimentally verified by measuring the pressure distribution along the transport tube. The continuity and momentum equations were used in the model formulation and variational model was used for the prediction of the fluid-particle interphase drag coefficient. Experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 16 mm i.d. acrylic tube at constant solids mass flux of 392.8 kg/m(2)s. Tube Reynolds number ranged from 170 to 5300 and the slip Reynolds number from 650 to 1060. Under these conditions loading ratio (G(p)/G(f)) varied between 66 and 2089. Visual observations show that particles flow downward in apparently homogenous dispersion. Experimental data for the static fluid pressure distribution along the transport tube agree quite well with the model predictions. The mean voidage and the particle velocity decrease, while the slip velocity increases with the increase in gas superficial velocity. The values of the pressure gradient, porosity, particle velocity and slip velocity along the tube were calculated according to the formulated model. In these calculations, particle-wall friction coefficient was determined indirectly by adjusting the f(p) value to agree with the experimental data. The effect of the value of fp on the model calculations was significant. Calculations show that the acceleration length for the same particles (1.94 mm) in downward counter-current gas-solids flow is about two times higher than the acceleration length in upward co-current gas-solids flow. In the system investigated, "choking" occurs at slip velocity which is about 73% of the single particle terminal velocity.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow",
volume = "256",
pages = "404-415",
doi = "10.1016/j.powtec.2014.01.090"
}

Garić Grulović, R., Kaluđerović-Radoičić, T., Arsenijević, Z., Đuriš, M.,& Grbavčić, Ž.. (2014). Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow. in Powder Technology
Elsevier., 256, 404-415.
https://doi.org/10.1016/j.powtec.2014.01.090

Garić Grulović R, Kaluđerović-Radoičić T, Arsenijević Z, Đuriš M, Grbavčić Ž. Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow. in Powder Technology. 2014;256:404-415.
doi:10.1016/j.powtec.2014.01.090 .

Garić Grulović, Radmila, Kaluđerović-Radoičić, Tatjana, Arsenijević, Zorana, Đuriš, Mihal, Grbavčić, Željko, "Hydrodynamic modeling of downward gas-solids flow. Part I: Counter-current flow" in Powder Technology, 256 (2014):404-415,
https://doi.org/10.1016/j.powtec.2014.01.090 . .