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  - Cvetković, Slobodan M.
AU  - Kaluđerović Radoičić, Tatjana
AU  - Grbović Novaković, Jasmina
AU  - Kovačević, Vlado
AU  - Lopičić, Zorica
AU  - Adamović, Vladimir
AU  - Kijevčanin, Mirjana
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5377
AB  - Renewable hydrogen produced from the waste streams can be a good option for clean energy production and reduction of greenhouse gases emissions into the environment. In this study, the potential for hydrogen production from the food industry wastewaters in Serbia and the further use of the calculated potentials were investigated. This was performed through two technological routes including the biogas steam reforming process and the electrolysis after biogas cogeneration process. Furthermore, the environmental impacts of these processes were considered. The total hydrogen potential via the biogas steam reforming process was 4094.70 tons, while the total hydrogen potential via the electrolysis after biogas cogeneration process was 1751.08 tons. These potentials can be used for direct energy production in the food industry, electricity production for the national electric grid, transport, injection in the natural gas grid and/or as a resource in the chemical industry. Regarding the Greenhouse Gas emissions reduction, hydrogen production by both routes represents a promising pathway. The results of this work can serve the decision makers to plan hydrogen application in the energy sector of the Republic of Serbia defining supporting measures for its application. Also, the presented analysis is enforceable in the Western Balkan countries for the application of hydrogen as an energy source in their systems for energy production, transport and economy.
PB  - Elsevier
T2  - Journal of Cleaner Production
T1  - Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters
VL  - 363
SP  - 132142
DO  - 10.1016/j.jclepro.2022.132142
ER  - 

@article{
author = "Cvetković, Slobodan M. and Kaluđerović Radoičić, Tatjana and Grbović Novaković, Jasmina and Kovačević, Vlado and Lopičić, Zorica and Adamović, Vladimir and Kijevčanin, Mirjana",
year = "2022",
abstract = "Renewable hydrogen produced from the waste streams can be a good option for clean energy production and reduction of greenhouse gases emissions into the environment. In this study, the potential for hydrogen production from the food industry wastewaters in Serbia and the further use of the calculated potentials were investigated. This was performed through two technological routes including the biogas steam reforming process and the electrolysis after biogas cogeneration process. Furthermore, the environmental impacts of these processes were considered. The total hydrogen potential via the biogas steam reforming process was 4094.70 tons, while the total hydrogen potential via the electrolysis after biogas cogeneration process was 1751.08 tons. These potentials can be used for direct energy production in the food industry, electricity production for the national electric grid, transport, injection in the natural gas grid and/or as a resource in the chemical industry. Regarding the Greenhouse Gas emissions reduction, hydrogen production by both routes represents a promising pathway. The results of this work can serve the decision makers to plan hydrogen application in the energy sector of the Republic of Serbia defining supporting measures for its application. Also, the presented analysis is enforceable in the Western Balkan countries for the application of hydrogen as an energy source in their systems for energy production, transport and economy.",
publisher = "Elsevier",
journal = "Journal of Cleaner Production",
title = "Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters",
volume = "363",
pages = "132142",
doi = "10.1016/j.jclepro.2022.132142"
}

Cvetković, S. M., Kaluđerović Radoičić, T., Grbović Novaković, J., Kovačević, V., Lopičić, Z., Adamović, V.,& Kijevčanin, M.. (2022). Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters. in Journal of Cleaner Production
Elsevier., 363, 132142.
https://doi.org/10.1016/j.jclepro.2022.132142

Cvetković SM, Kaluđerović Radoičić T, Grbović Novaković J, Kovačević V, Lopičić Z, Adamović V, Kijevčanin M. Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters. in Journal of Cleaner Production. 2022;363:132142.
doi:10.1016/j.jclepro.2022.132142 .

Cvetković, Slobodan M., Kaluđerović Radoičić, Tatjana, Grbović Novaković, Jasmina, Kovačević, Vlado, Lopičić, Zorica, Adamović, Vladimir, Kijevčanin, Mirjana, "Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters" in Journal of Cleaner Production, 363 (2022):132142,
https://doi.org/10.1016/j.jclepro.2022.132142 . .

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  - Pešić, Radojica
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1732
AB  - The aim of this work was the experimental investigation of the particle friction factor for air flow through a packed bed of particles at ambient and elevated temperatures. The experiments were performed by measuring the pressure drop across the packed bed, heated to the desired temperature by hot air. Glass spherical particles of seven different diameters were used. The temperature range of the air flowing through the packed bed was from 20 to 350°C and the bed voidages were from 0.3574 to 0.4303. The obtained results were correlated using a number of available literature correlations. The overall best fit of all of the experimental data was obtained using the Ergun equation, with mean absolute deviation of 10.90%. Ergun's equation gave somewhat better results in correlating the data at ambient temperature with mean absolute deviation of 9.77%, while correlation of the data at elevated temperatures gave mean absolute deviation of 12.38%. The vast majority of the correlations used gave better results when applied to ambient temperature data than to the data at elevated temperatures. Based on the results obtained, the Ergun equation is proposed for friction factor calculation both at ambient and at elevated temperatures.
AB  - Cilj ovog rada je bio eksperimentalno ispitivanje koeficijenta trenja fluid-čestice prilikom strujanja vazduha kroz pakovani sloj čestica, na sobnoj i povišenim temperaturama. Izvršeno je eksperimentalno merenje pada pritiska u pakovanim slojevima različitih temperatura zagrejanih korišćenjem vrelog vazduha. Kao materijal za pakovanje korišćene su sferične staklene kuglice 7 različitih prečnika. Temperaturni interval u kom su vršeni eksperimenti bio je od 20 do 350°C, dok su poroznosti sloja iznosile od 0,3574 do 0,4303. Dobijeni rezultati korelisani su korišćenjem većeg broja literaturnih korelacija. Najbolje slaganje sa eksperimentalnim podacima pokazala je Ergunova jednačina [1], sa srednjim procentnim odstupanjem od 10,90%. Ergunova jednačina je dala bolje rezultate prilikom korelisanja podataka na sobnoj temperaturi (srednja procentna greška 9,77%), dok je korelisanje podataka na povišenim temperaturama izvršeno sa greškom od 12,38%. Većina testiranih literaturnih korelacija je dala bolje rezultate pri korelisanju podataka dobijenih na sobnoj temperaturi u odnosu na podatke dobijene na povišenim temperaturama. Na osnovu dobijenih rezultata, predlaže se korišćenje Ergunove jednačine za izračunavanje koeficijenta trenja fluid-čestice kako na sobnoj, tako i na povišenim temperaturama.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures
T1  - Pad pritiska u pakovanom sloju sferičnih čestica na sobnoj i povišenim temperaturama
VL  - 21
IS  - 3
SP  - 419
EP  - 427
DO  - 10.2298/CICEQ140618044P
ER  - 

@article{
author = "Pešić, Radojica and Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Arsenijević, Zorana and Grbavčić, Željko",
year = "2015",
abstract = "The aim of this work was the experimental investigation of the particle friction factor for air flow through a packed bed of particles at ambient and elevated temperatures. The experiments were performed by measuring the pressure drop across the packed bed, heated to the desired temperature by hot air. Glass spherical particles of seven different diameters were used. The temperature range of the air flowing through the packed bed was from 20 to 350°C and the bed voidages were from 0.3574 to 0.4303. The obtained results were correlated using a number of available literature correlations. The overall best fit of all of the experimental data was obtained using the Ergun equation, with mean absolute deviation of 10.90%. Ergun's equation gave somewhat better results in correlating the data at ambient temperature with mean absolute deviation of 9.77%, while correlation of the data at elevated temperatures gave mean absolute deviation of 12.38%. The vast majority of the correlations used gave better results when applied to ambient temperature data than to the data at elevated temperatures. Based on the results obtained, the Ergun equation is proposed for friction factor calculation both at ambient and at elevated temperatures., Cilj ovog rada je bio eksperimentalno ispitivanje koeficijenta trenja fluid-čestice prilikom strujanja vazduha kroz pakovani sloj čestica, na sobnoj i povišenim temperaturama. Izvršeno je eksperimentalno merenje pada pritiska u pakovanim slojevima različitih temperatura zagrejanih korišćenjem vrelog vazduha. Kao materijal za pakovanje korišćene su sferične staklene kuglice 7 različitih prečnika. Temperaturni interval u kom su vršeni eksperimenti bio je od 20 do 350°C, dok su poroznosti sloja iznosile od 0,3574 do 0,4303. Dobijeni rezultati korelisani su korišćenjem većeg broja literaturnih korelacija. Najbolje slaganje sa eksperimentalnim podacima pokazala je Ergunova jednačina [1], sa srednjim procentnim odstupanjem od 10,90%. Ergunova jednačina je dala bolje rezultate prilikom korelisanja podataka na sobnoj temperaturi (srednja procentna greška 9,77%), dok je korelisanje podataka na povišenim temperaturama izvršeno sa greškom od 12,38%. Većina testiranih literaturnih korelacija je dala bolje rezultate pri korelisanju podataka dobijenih na sobnoj temperaturi u odnosu na podatke dobijene na povišenim temperaturama. Na osnovu dobijenih rezultata, predlaže se korišćenje Ergunove jednačine za izračunavanje koeficijenta trenja fluid-čestice kako na sobnoj, tako i na povišenim temperaturama.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures, Pad pritiska u pakovanom sloju sferičnih čestica na sobnoj i povišenim temperaturama",
volume = "21",
number = "3",
pages = "419-427",
doi = "10.2298/CICEQ140618044P"
}

Pešić, R., Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Arsenijević, Z.,& Grbavčić, Ž.. (2015). Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 21(3), 419-427.
https://doi.org/10.2298/CICEQ140618044P

Pešić R, Kaluđerović-Radoičić T, Bošković-Vragolović N, Arsenijević Z, Grbavčić Ž. Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2015;21(3):419-427.
doi:10.2298/CICEQ140618044P .

Pešić, Radojica, Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Arsenijević, Zorana, Grbavčić, Željko, "Pressure drop in packed beds of spherical particles at ambient and elevated air temperatures" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 21, no. 3 (2015):419-427,
https://doi.org/10.2298/CICEQ140618044P . .

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 . .

TY  - JOUR
AU  - Pesic, Radojica
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Bošković-Vragolović, Nevenka
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1437
AB  - In this paper, heat transfer coefficients between the hot packed beds of particles and the larger cold immersed sphere were experimentally determined. The packed beds consisted of mono-sized spherical glass particles of d(p), = 1.2, 1.94 and 2.98 mm. The aluminum test spheres of D-p = 6, 12 and 20 mm with K-type (Ni/A1) thermocouples inserted in them were immersed into the bed. The temperatures of the test spheres were recorded until the thermal equilibrium was reached. From these recordings, heat transfer coefficients were determined. The experiments were performed in the range of gas superficial velocity of similar to 0.3-0.8 m/s and the bed temperature from 90 to 320 degrees C. It was found that the measured heat transfer coefficients increased with the increase in gas superficial velocity, while only a slight increase with temperature was observed for test spheres D-p = 6 and 12 mm in the investigated temperature interval. The heat transfer coefficients were generally larger for smaller test spheres, while they did not show significant dependence on the size of the bed particles. The literature correlations for heat transfer coefficients in packed beds in form of Nusselt number and heat transfer factor j(H) were compared to experimental data from this work. The correlations proposed by Collier et al. (2004) [18] and Handley and Heggs (1968) [2] fit our experimental data best. The mean error between the experimentally determined heat transfer coefficients and the ones calculated from Collier et al. (2004) [18] correlation was 12.7%.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - International Journal of Heat and Mass Transfer
T1  - Heat transfer between a packed bed and a larger immersed spherical particle
VL  - 78
SP  - 130
EP  - 136
DO  - 10.1016/j.ijheatmasstransfer.2014.06.040
ER  - 

@article{
author = "Pesic, Radojica and Kaluđerović-Radoičić, Tatjana and Bošković-Vragolović, Nevenka and Arsenijević, Zorana and Grbavčić, Željko",
year = "2014",
abstract = "In this paper, heat transfer coefficients between the hot packed beds of particles and the larger cold immersed sphere were experimentally determined. The packed beds consisted of mono-sized spherical glass particles of d(p), = 1.2, 1.94 and 2.98 mm. The aluminum test spheres of D-p = 6, 12 and 20 mm with K-type (Ni/A1) thermocouples inserted in them were immersed into the bed. The temperatures of the test spheres were recorded until the thermal equilibrium was reached. From these recordings, heat transfer coefficients were determined. The experiments were performed in the range of gas superficial velocity of similar to 0.3-0.8 m/s and the bed temperature from 90 to 320 degrees C. It was found that the measured heat transfer coefficients increased with the increase in gas superficial velocity, while only a slight increase with temperature was observed for test spheres D-p = 6 and 12 mm in the investigated temperature interval. The heat transfer coefficients were generally larger for smaller test spheres, while they did not show significant dependence on the size of the bed particles. The literature correlations for heat transfer coefficients in packed beds in form of Nusselt number and heat transfer factor j(H) were compared to experimental data from this work. The correlations proposed by Collier et al. (2004) [18] and Handley and Heggs (1968) [2] fit our experimental data best. The mean error between the experimentally determined heat transfer coefficients and the ones calculated from Collier et al. (2004) [18] correlation was 12.7%.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "International Journal of Heat and Mass Transfer",
title = "Heat transfer between a packed bed and a larger immersed spherical particle",
volume = "78",
pages = "130-136",
doi = "10.1016/j.ijheatmasstransfer.2014.06.040"
}

Pesic, R., Kaluđerović-Radoičić, T., Bošković-Vragolović, N., Arsenijević, Z.,& Grbavčić, Ž.. (2014). Heat transfer between a packed bed and a larger immersed spherical particle. in International Journal of Heat and Mass Transfer
Oxford : Pergamon-Elsevier Science Ltd., 78, 130-136.
https://doi.org/10.1016/j.ijheatmasstransfer.2014.06.040

Pesic R, Kaluđerović-Radoičić T, Bošković-Vragolović N, Arsenijević Z, Grbavčić Ž. Heat transfer between a packed bed and a larger immersed spherical particle. in International Journal of Heat and Mass Transfer. 2014;78:130-136.
doi:10.1016/j.ijheatmasstransfer.2014.06.040 .

Pesic, Radojica, Kaluđerović-Radoičić, Tatjana, Bošković-Vragolović, Nevenka, Arsenijević, Zorana, Grbavčić, Željko, "Heat transfer between a packed bed and a larger immersed spherical particle" in International Journal of Heat and Mass Transfer, 78 (2014):130-136,
https://doi.org/10.1016/j.ijheatmasstransfer.2014.06.040 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Garić Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1182
AB  - Particle velocities have been measured in two-dimensional water fluidized beds of mono-sized spherical glass particles d(p) = 1.94, 2.98, 4.00 and 6.00 mm in diameter. For each particle size, a separate column was constructed in a manner that the column thickness corresponded to approximately 3 particle diameters. A large number of observations are required to obtain a stable value of total particle speed. The presented data indicated that in order to obtain a stable value of the mean total particle speed, a minimum of 4000 data points was needed. The distribution of total particle speeds follows the Maxwell distribution quite well. The effect of water velocity on the distribution function was similar to the effect of temperature on molecular speed distribution in the kinetic theory. The distribution of vertical and horizontal particle velocity components followed approximately a modified Gaussian distribution. A correlation for predicting the total mean particle speed in 2D water fluidized beds is proposed. The mean absolute deviation between the experimental and measured particle velocities for the present data is 11.0%. The proposed correlation predicts the data of Carlos and Richardson [5] and Latif and Richardson [6] for 3D fluidized beds reasonably well.
PB  - Elsevier
T2  - Powder Technology
T1  - Particle velocities in quasi two-dimensional water fluidized beds of spherical particles
VL  - 246
SP  - 98
EP  - 107
DO  - 10.1016/j.powtec.2013.05.009
ER  - 

@article{
author = "Đuriš, Mihal and Kaluđerović-Radoičić, Tatjana and Garić Grulović, Radmila and Arsenijević, Zorana and Grbavčić, Željko",
year = "2013",
abstract = "Particle velocities have been measured in two-dimensional water fluidized beds of mono-sized spherical glass particles d(p) = 1.94, 2.98, 4.00 and 6.00 mm in diameter. For each particle size, a separate column was constructed in a manner that the column thickness corresponded to approximately 3 particle diameters. A large number of observations are required to obtain a stable value of total particle speed. The presented data indicated that in order to obtain a stable value of the mean total particle speed, a minimum of 4000 data points was needed. The distribution of total particle speeds follows the Maxwell distribution quite well. The effect of water velocity on the distribution function was similar to the effect of temperature on molecular speed distribution in the kinetic theory. The distribution of vertical and horizontal particle velocity components followed approximately a modified Gaussian distribution. A correlation for predicting the total mean particle speed in 2D water fluidized beds is proposed. The mean absolute deviation between the experimental and measured particle velocities for the present data is 11.0%. The proposed correlation predicts the data of Carlos and Richardson [5] and Latif and Richardson [6] for 3D fluidized beds reasonably well.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Particle velocities in quasi two-dimensional water fluidized beds of spherical particles",
volume = "246",
pages = "98-107",
doi = "10.1016/j.powtec.2013.05.009"
}

Đuriš, M., Kaluđerović-Radoičić, T., Garić Grulović, R., Arsenijević, Z.,& Grbavčić, Ž.. (2013). Particle velocities in quasi two-dimensional water fluidized beds of spherical particles. in Powder Technology
Elsevier., 246, 98-107.
https://doi.org/10.1016/j.powtec.2013.05.009

Đuriš M, Kaluđerović-Radoičić T, Garić Grulović R, Arsenijević Z, Grbavčić Ž. Particle velocities in quasi two-dimensional water fluidized beds of spherical particles. in Powder Technology. 2013;246:98-107.
doi:10.1016/j.powtec.2013.05.009 .

Đuriš, Mihal, Kaluđerović-Radoičić, Tatjana, Garić Grulović, Radmila, Arsenijević, Zorana, Grbavčić, Željko, "Particle velocities in quasi two-dimensional water fluidized beds of spherical particles" in Powder Technology, 246 (2013):98-107,
https://doi.org/10.1016/j.powtec.2013.05.009 . .