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  - 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  - Jaćimovski, Darko
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Bošković-Vragolović, Nevenka
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1759
AB  - Wall-to-bed heat transfer in particulate fluidized beds of spherical particles was studied. Experiments were performed using spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. copper tube equipped with a steam jacket. Heat transfer data related to the fluid-particle interphase drag coefficient were obtained and compared with previous results for wall-to-bed mass transfer in fluidized beds [Bogkovit et aL, Powder Technol., 79 (1994) 217]. All the data for momentum, heat and mass transfer in particulate fluidized beds of spherical particles, showed the existence of an analogy among these three phenomena.
PB  - Elsevier
T2  - Powder Technology
T1  - Analogy between momentum and heat transfer in liquid-solid fluidized beds
VL  - 274
SP  - 213
EP  - 216
DO  - 10.1016/j.powtec.2014.11.010
ER  - 

@article{
author = "Jaćimovski, Darko and Garić Grulović, Radmila and Grbavčić, Željko and Bošković-Vragolović, Nevenka",
year = "2015",
abstract = "Wall-to-bed heat transfer in particulate fluidized beds of spherical particles was studied. Experiments were performed using spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. copper tube equipped with a steam jacket. Heat transfer data related to the fluid-particle interphase drag coefficient were obtained and compared with previous results for wall-to-bed mass transfer in fluidized beds [Bogkovit et aL, Powder Technol., 79 (1994) 217]. All the data for momentum, heat and mass transfer in particulate fluidized beds of spherical particles, showed the existence of an analogy among these three phenomena.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Analogy between momentum and heat transfer in liquid-solid fluidized beds",
volume = "274",
pages = "213-216",
doi = "10.1016/j.powtec.2014.11.010"
}

Jaćimovski, D., Garić Grulović, R., Grbavčić, Ž.,& Bošković-Vragolović, N.. (2015). Analogy between momentum and heat transfer in liquid-solid fluidized beds. in Powder Technology
Elsevier., 274, 213-216.
https://doi.org/10.1016/j.powtec.2014.11.010

Jaćimovski D, Garić Grulović R, Grbavčić Ž, Bošković-Vragolović N. Analogy between momentum and heat transfer in liquid-solid fluidized beds. in Powder Technology. 2015;274:213-216.
doi:10.1016/j.powtec.2014.11.010 .

Jaćimovski, Darko, Garić Grulović, Radmila, Grbavčić, Željko, Bošković-Vragolović, Nevenka, "Analogy between momentum and heat transfer in liquid-solid fluidized beds" in Powder Technology, 274 (2015):213-216,
https://doi.org/10.1016/j.powtec.2014.11.010 . .

TY  - JOUR
AU  - Jaćimovski, Darko
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Bošković-Vragolović, Nevenka
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3199
AB  - Wall-to-bed heat transfer in particulate fluidized beds of spherical particles was studied. Experiments were performed using spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. copper tube equipped with a steam jacket. Heat transfer data related to the fluid-particle interphase drag coefficient were obtained and compared with previous results for wall-to-bed mass transfer in fluidized beds [Bogkovit et aL, Powder Technol., 79 (1994) 217]. All the data for momentum, heat and mass transfer in particulate fluidized beds of spherical particles, showed the existence of an analogy among these three phenomena.
PB  - Elsevier
T2  - Powder Technology
T1  - Analogy between momentum and heat transfer in liquid-solid fluidized beds
VL  - 274
SP  - 213
EP  - 216
DO  - 10.1016/j.powtec.2014.11.010
ER  - 

@article{
author = "Jaćimovski, Darko and Garić Grulović, Radmila and Grbavčić, Željko and Bošković-Vragolović, Nevenka",
year = "2015",
abstract = "Wall-to-bed heat transfer in particulate fluidized beds of spherical particles was studied. Experiments were performed using spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. copper tube equipped with a steam jacket. Heat transfer data related to the fluid-particle interphase drag coefficient were obtained and compared with previous results for wall-to-bed mass transfer in fluidized beds [Bogkovit et aL, Powder Technol., 79 (1994) 217]. All the data for momentum, heat and mass transfer in particulate fluidized beds of spherical particles, showed the existence of an analogy among these three phenomena.",
publisher = "Elsevier",
journal = "Powder Technology",
title = "Analogy between momentum and heat transfer in liquid-solid fluidized beds",
volume = "274",
pages = "213-216",
doi = "10.1016/j.powtec.2014.11.010"
}

Jaćimovski, D., Garić Grulović, R., Grbavčić, Ž.,& Bošković-Vragolović, N.. (2015). Analogy between momentum and heat transfer in liquid-solid fluidized beds. in Powder Technology
Elsevier., 274, 213-216.
https://doi.org/10.1016/j.powtec.2014.11.010

Jaćimovski D, Garić Grulović R, Grbavčić Ž, Bošković-Vragolović N. Analogy between momentum and heat transfer in liquid-solid fluidized beds. in Powder Technology. 2015;274:213-216.
doi:10.1016/j.powtec.2014.11.010 .

Jaćimovski, Darko, Garić Grulović, Radmila, Grbavčić, Željko, Bošković-Vragolović, Nevenka, "Analogy between momentum and heat transfer in liquid-solid fluidized beds" in Powder Technology, 274 (2015):213-216,
https://doi.org/10.1016/j.powtec.2014.11.010 . .

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  - Bošković-Vragolović, Nevenka
AU  - Garić Grulović, Radmila
AU  - Pjanović, Rada
AU  - Grbavčić, Željko
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1294
AB  - Mass transfer coefficient in single phase flow around short cylinder, has been studied experimentally using adsorption method. Experiments were conducted in "two-dimensional" column 140 x 10 x 200 mm. The mass transfer data were obtained by studying transfer for flow past single cylinder, 30 mm in diameter. This paper, also, discusses the possibilities of application of the adsorption method for fluid flow visualization. Local and average mass transfer coefficients were determined from color intensity on the surface of foils of silica gel. Experimental correlations for Sh = f (Re) and j(D) = f (Re) were established using mass transfer coefficients data.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - International Journal of Heat and Mass Transfer
T1  - Mass transfer and fluid flow visualization for single cylinder by the adsorption method
VL  - 59
SP  - 155
EP  - 160
DO  - 10.1016/j.ijheatmasstransfer.2012.11.077
ER  - 

@article{
author = "Bošković-Vragolović, Nevenka and Garić Grulović, Radmila and Pjanović, Rada and Grbavčić, Željko",
year = "2013",
abstract = "Mass transfer coefficient in single phase flow around short cylinder, has been studied experimentally using adsorption method. Experiments were conducted in "two-dimensional" column 140 x 10 x 200 mm. The mass transfer data were obtained by studying transfer for flow past single cylinder, 30 mm in diameter. This paper, also, discusses the possibilities of application of the adsorption method for fluid flow visualization. Local and average mass transfer coefficients were determined from color intensity on the surface of foils of silica gel. Experimental correlations for Sh = f (Re) and j(D) = f (Re) were established using mass transfer coefficients data.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "International Journal of Heat and Mass Transfer",
title = "Mass transfer and fluid flow visualization for single cylinder by the adsorption method",
volume = "59",
pages = "155-160",
doi = "10.1016/j.ijheatmasstransfer.2012.11.077"
}

Bošković-Vragolović, N., Garić Grulović, R., Pjanović, R.,& Grbavčić, Ž.. (2013). Mass transfer and fluid flow visualization for single cylinder by the adsorption method. in International Journal of Heat and Mass Transfer
Oxford : Pergamon-Elsevier Science Ltd., 59, 155-160.
https://doi.org/10.1016/j.ijheatmasstransfer.2012.11.077

Bošković-Vragolović N, Garić Grulović R, Pjanović R, Grbavčić Ž. Mass transfer and fluid flow visualization for single cylinder by the adsorption method. in International Journal of Heat and Mass Transfer. 2013;59:155-160.
doi:10.1016/j.ijheatmasstransfer.2012.11.077 .

Bošković-Vragolović, Nevenka, Garić Grulović, Radmila, Pjanović, Rada, Grbavčić, Željko, "Mass transfer and fluid flow visualization for single cylinder by the adsorption method" in International Journal of Heat and Mass Transfer, 59 (2013):155-160,
https://doi.org/10.1016/j.ijheatmasstransfer.2012.11.077 . .

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 . .

TY  - JOUR
AU  - Đuriš, Mihal
AU  - Garić Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Jaćimovski, Darko
AU  - Grbavčić, Željko
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1291
AB  - Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64 mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to epsilon=1 on the plot log (U) vs. log (epsilon), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture d(p)=0.75-1.25 mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, remarkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures d(p)=1.60-2.00 mm, d(p)=1.40-2.00 mm and d(p)=1.166-2.00 mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5.
PB  - Elsevier Science Sa, Lausanne
T2  - Powder Technology
T1  - Segregation in water fluidized beds of sand particles
VL  - 235
SP  - 173
EP  - 179
DO  - 10.1016/j.powtec.2012.10.004
ER  - 

@article{
author = "Đuriš, Mihal and Garić Grulović, Radmila and Arsenijević, Zorana and Jaćimovski, Darko and Grbavčić, Željko",
year = "2013",
abstract = "Fluidization experiments were conducted on four fractions of filtration (quartz) sand using columns of 144 and 64 mm i.d. The size distribution of the fractions obtained by sieving followed an approximately modified normal (Gaussian) particle size distribution with respect to the projected particle diameter, while the shape factor decreased linearly with increasing projected particle diameter. The expansion characteristics of the sand particles followed a Richardson-Zaki relationship. The intercept velocity, i.e., the extrapolated value of the fluid superficial velocity to epsilon=1 on the plot log (U) vs. log (epsilon), agreed quite well with the experimentally determined mean free settling velocity of the cloud of about 30 randomly selected particles. During fluidization, the beds were hydraulically separated into 10 sub-fractions, which are then analyzed. For the mixture d(p)=0.75-1.25 mm during fluidization at an overall bed expansion of 35%, the bed partially segregated since, remarkably, the smallest particles were concentrated at the top, while the largest particles were concentrated in the bottom zone. In the remaining part of the bed (about 80% of total mass), the particles were well mixed. Similar experiments were performed with sand mixtures d(p)=1.60-2.00 mm, d(p)=1.40-2.00 mm and d(p)=1.166-2.00 mm. By analyzing the particle size distribution at the bottom and at the top of the bed, it was concluded that the bed was well mixed if the sieving ratio of the largest to smallest sieve opening was less than about 1.5.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Powder Technology",
title = "Segregation in water fluidized beds of sand particles",
volume = "235",
pages = "173-179",
doi = "10.1016/j.powtec.2012.10.004"
}

Đuriš, M., Garić Grulović, R., Arsenijević, Z., Jaćimovski, D.,& Grbavčić, Ž.. (2013). Segregation in water fluidized beds of sand particles. in Powder Technology
Elsevier Science Sa, Lausanne., 235, 173-179.
https://doi.org/10.1016/j.powtec.2012.10.004

Đuriš M, Garić Grulović R, Arsenijević Z, Jaćimovski D, Grbavčić Ž. Segregation in water fluidized beds of sand particles. in Powder Technology. 2013;235:173-179.
doi:10.1016/j.powtec.2012.10.004 .

Đuriš, Mihal, Garić Grulović, Radmila, Arsenijević, Zorana, Jaćimovski, Darko, Grbavčić, Željko, "Segregation in water fluidized beds of sand particles" in Powder Technology, 235 (2013):173-179,
https://doi.org/10.1016/j.powtec.2012.10.004 . .

TY  - CHAP
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1386
AB  - The research of vertical two-phase gas-solid and liquid-solid flow is generally important in chemical, biochemical and mechanical processes. The modeling of a vertical gas-solid and liquid-solid flow, where the solid is coarse spherical particles, is very important for practical applications such as spouted beds and modified spout-fluidized beds with draft tube. For modeling of these systems two-phase flow equations must be used. For vertical non-accelerating fluid-solids flow of coarse spherical particles the one-dimensional steady-state model has been presented. The theoretical bases of the model are the continuity and momentum equations for the fluid and particle of Nakamura and Capes [1], and the variational model for calculating the fluid-particle interphase drag coefficient (Grbavcic et al. [2]). The main model objective is establishing relations for: the fluid-particle interphase drag coefficient, the fluid-wall friction coefficient and the particle-wall friction coefficient. A new method for the indirect determination of the particle-wall friction coefficient in the vertical pneumatic and hydraulic transport of coarse particles is presented. The proposed procedure simplifies experimental work since it does not require experimental determination of the voidage in the transport system. In vertical gas-solid flow two major flow regimes are exist. There is dilute flow with an apparently uniform distribution of solid in the flowing mixture and the dense phase flow. In vertical liquid-solid flow two different flow regimes are identified: "turbulent" and "parallel". The method for predicting the regime transition for the gas-solid flow is the choking criterion proposed by Day et al. [3]. Besides that, choking criterion for vertical gas-solid flow could be used for predict of the regime transition in liquid-solid flow (Grbavcic et al. [4], Garic-Grulovic et al. [5-7]).
PB  - Nova Science Publishers, Inc.
T2  - Fluid Transport: Theory, Dynamics and Applications
T1  - Fluidodynamics characteristics of a vertical gas-solid and liquid-solid flow
SP  - 1
EP  - 44
UR  - https://hdl.handle.net/21.15107/rcub_cer_1386
ER  - 

@inbook{
author = "Garić Grulović, Radmila and Grbavčić, Željko",
year = "2013",
abstract = "The research of vertical two-phase gas-solid and liquid-solid flow is generally important in chemical, biochemical and mechanical processes. The modeling of a vertical gas-solid and liquid-solid flow, where the solid is coarse spherical particles, is very important for practical applications such as spouted beds and modified spout-fluidized beds with draft tube. For modeling of these systems two-phase flow equations must be used. For vertical non-accelerating fluid-solids flow of coarse spherical particles the one-dimensional steady-state model has been presented. The theoretical bases of the model are the continuity and momentum equations for the fluid and particle of Nakamura and Capes [1], and the variational model for calculating the fluid-particle interphase drag coefficient (Grbavcic et al. [2]). The main model objective is establishing relations for: the fluid-particle interphase drag coefficient, the fluid-wall friction coefficient and the particle-wall friction coefficient. A new method for the indirect determination of the particle-wall friction coefficient in the vertical pneumatic and hydraulic transport of coarse particles is presented. The proposed procedure simplifies experimental work since it does not require experimental determination of the voidage in the transport system. In vertical gas-solid flow two major flow regimes are exist. There is dilute flow with an apparently uniform distribution of solid in the flowing mixture and the dense phase flow. In vertical liquid-solid flow two different flow regimes are identified: "turbulent" and "parallel". The method for predicting the regime transition for the gas-solid flow is the choking criterion proposed by Day et al. [3]. Besides that, choking criterion for vertical gas-solid flow could be used for predict of the regime transition in liquid-solid flow (Grbavcic et al. [4], Garic-Grulovic et al. [5-7]).",
publisher = "Nova Science Publishers, Inc.",
journal = "Fluid Transport: Theory, Dynamics and Applications",
booktitle = "Fluidodynamics characteristics of a vertical gas-solid and liquid-solid flow",
pages = "1-44",
url = "https://hdl.handle.net/21.15107/rcub_cer_1386"
}

Garić Grulović, R.,& Grbavčić, Ž.. (2013). Fluidodynamics characteristics of a vertical gas-solid and liquid-solid flow. in Fluid Transport: Theory, Dynamics and Applications
Nova Science Publishers, Inc.., 1-44.
https://hdl.handle.net/21.15107/rcub_cer_1386

Garić Grulović R, Grbavčić Ž. Fluidodynamics characteristics of a vertical gas-solid and liquid-solid flow. in Fluid Transport: Theory, Dynamics and Applications. 2013;:1-44.
https://hdl.handle.net/21.15107/rcub_cer_1386 .

Garić Grulović, Radmila, Grbavčić, Željko, "Fluidodynamics characteristics of a vertical gas-solid and liquid-solid flow" in Fluid Transport: Theory, Dynamics and Applications (2013):1-44,
https://hdl.handle.net/21.15107/rcub_cer_1386 .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Garić Grulović, Radmila
AU  - Đuriš, Mihal
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/893
AB  - Ethylene oxide (EtO) is an organic compound, which is used as a starting material in the production of polymers and as sterilizing agent for thermolabile materials. Although ethylene oxide is not common as an organic pollutant, its removal from numerous emission sources (e.g., ethylene oxide production plants or food and pharmaceutical sterilizing units) is of crucial importance because of its mutagenic, teratogenic and cancerogenic effects on human health. The objective of this paper is the experimental investigation of ethylene oxide (EtO) absorption in diluted aqueous solution of sulfuric acid in order to evaluate the applicability of this procedure as well as to obtain project parameters for industrial plant realizetion. It was found that absorption is suitable as the fist step in the purification treatment of high EtO concentrations in the emission gases. According to the literature data, the basic parameter that defines the scrubber efficiency is the contact time, i.e. the ratio of packing height in the scrubber to the velocity of the gas mixture. To investigate the characteristics of wet treatment in a broad range of contact time, parts of the experimental studies were conducted in a system with two and with three scrubbers in series. The obtained experimental results show that the high degree of EtO removal can be achieved (>98%) when the contact time is sufficiently long (about 25s). The process is effective until the concentration of formed glycol in the solution reaches a value of about 20%. The process is safe and there is no danger of ignition and explosion of air and EtO mixture, although at the entrance to the scrubber EtO concentrations are significantly above the lower explosive limit.
AB  - Predmet ovog rada je istraživanje mogućnosti uklanjanja etilen-oksida (EtO) iz otpadnih gasova apsorpcijom u razblaženim vodenim rastvorima sumporne kiseline sa ciljem da se ocene mogućnosti primene ove tehnologije za projektovanje industrijskog sistema. Apsorpcija je naročito pogodan postupak kao prvi stepen prečišćavanja u slučajevima kada je emisiona koncentracija EtO visoka. Eksperimentalno je ispitan uticaj širokog opsega vremena kontakta na efikasnost uklanjanja EtO. Ulazne koncentracije EtO su varirane od 4 do 40 vol.%, a vremena kontakta od 4 do 40 s. Apsorcija je izvođena u rastvoru sumporne kiseline (H2SO4) pri čemu dolazi do hidrolize EtO u etilen-glikol. Efikasnost apsorpcije EtO opada sa povećanjem koncentracije etilen-glikola u apsorpcionom rastvoru. Rezultati eksperimentalnih ispitivanja su pokazali da se može postići visok stepen efikasnosti uklanjanja EtO (> 98%) pod uslovom da je vreme kontakta dovoljno dugo (oko 25s).
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Removal of ethylene oxide from waste gases by absorption
T1  - Uklanjanje etilen-oksida iz otpadnih gasova postupkom apsorpcije
VL  - 65
IS  - 4
SP  - 389
EP  - 395
DO  - 10.2298/HEMIND110329026A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbavčić, Željko and Grbić, Boško and Radić, Nenad and Garić Grulović, Radmila and Đuriš, Mihal",
year = "2011",
abstract = "Ethylene oxide (EtO) is an organic compound, which is used as a starting material in the production of polymers and as sterilizing agent for thermolabile materials. Although ethylene oxide is not common as an organic pollutant, its removal from numerous emission sources (e.g., ethylene oxide production plants or food and pharmaceutical sterilizing units) is of crucial importance because of its mutagenic, teratogenic and cancerogenic effects on human health. The objective of this paper is the experimental investigation of ethylene oxide (EtO) absorption in diluted aqueous solution of sulfuric acid in order to evaluate the applicability of this procedure as well as to obtain project parameters for industrial plant realizetion. It was found that absorption is suitable as the fist step in the purification treatment of high EtO concentrations in the emission gases. According to the literature data, the basic parameter that defines the scrubber efficiency is the contact time, i.e. the ratio of packing height in the scrubber to the velocity of the gas mixture. To investigate the characteristics of wet treatment in a broad range of contact time, parts of the experimental studies were conducted in a system with two and with three scrubbers in series. The obtained experimental results show that the high degree of EtO removal can be achieved (>98%) when the contact time is sufficiently long (about 25s). The process is effective until the concentration of formed glycol in the solution reaches a value of about 20%. The process is safe and there is no danger of ignition and explosion of air and EtO mixture, although at the entrance to the scrubber EtO concentrations are significantly above the lower explosive limit., Predmet ovog rada je istraživanje mogućnosti uklanjanja etilen-oksida (EtO) iz otpadnih gasova apsorpcijom u razblaženim vodenim rastvorima sumporne kiseline sa ciljem da se ocene mogućnosti primene ove tehnologije za projektovanje industrijskog sistema. Apsorpcija je naročito pogodan postupak kao prvi stepen prečišćavanja u slučajevima kada je emisiona koncentracija EtO visoka. Eksperimentalno je ispitan uticaj širokog opsega vremena kontakta na efikasnost uklanjanja EtO. Ulazne koncentracije EtO su varirane od 4 do 40 vol.%, a vremena kontakta od 4 do 40 s. Apsorcija je izvođena u rastvoru sumporne kiseline (H2SO4) pri čemu dolazi do hidrolize EtO u etilen-glikol. Efikasnost apsorpcije EtO opada sa povećanjem koncentracije etilen-glikola u apsorpcionom rastvoru. Rezultati eksperimentalnih ispitivanja su pokazali da se može postići visok stepen efikasnosti uklanjanja EtO (> 98%) pod uslovom da je vreme kontakta dovoljno dugo (oko 25s).",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Removal of ethylene oxide from waste gases by absorption, Uklanjanje etilen-oksida iz otpadnih gasova postupkom apsorpcije",
volume = "65",
number = "4",
pages = "389-395",
doi = "10.2298/HEMIND110329026A"
}

Arsenijević, Z., Grbavčić, Ž., Grbić, B., Radić, N., Garić Grulović, R.,& Đuriš, M.. (2011). Removal of ethylene oxide from waste gases by absorption. in Hemijska industrija
Association of Chemical Engineers of Serbia., 65(4), 389-395.
https://doi.org/10.2298/HEMIND110329026A

Arsenijević Z, Grbavčić Ž, Grbić B, Radić N, Garić Grulović R, Đuriš M. Removal of ethylene oxide from waste gases by absorption. in Hemijska industrija. 2011;65(4):389-395.
doi:10.2298/HEMIND110329026A .

Arsenijević, Zorana, Grbavčić, Željko, Grbić, Boško, Radić, Nenad, Garić Grulović, Radmila, Đuriš, Mihal, "Removal of ethylene oxide from waste gases by absorption" in Hemijska industrija, 65, no. 4 (2011):389-395,
https://doi.org/10.2298/HEMIND110329026A . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Garić Grulović, Radmila
AU  - Miletic, Sasa
AU  - Savcic, Gordan
AU  - Dordevic, Bojana
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/663
AB  - Industrial liquid wastes can be in the form of solutions, suspensions, sludges, scums or waste oil and have organic properties. The objective of this work was to demonstrate the technical feasibility of a fluidized bed as a clean technology for burning liquid waste from a pesticide production plant. The combustion of liquid waste mixtures, obtained from realistic samples, was investigated in a pilot scale fluidized bed with quartz sand particles of 0.63-1.25 mm in diameter and 2610 kg/m3 in density at 800-950°C. To ensure complete combustion of liquid waste and additional fuel, the combustion chamber was supplied with excess air and the U/UmF (at ambient temperature) was in between 1.1 and 2.3. In the fluidized bed chamber, liquid waste, additional liquid fuel and air can be brought into intense contact sufficient to permit combustion in bed without backfire problems. The experimental results show that the fluidized bed furnace offers excellent thermal uniformity and temperature control. The results of the combustion tests showed that degradation of liquid wastes can be successfully realized in a fluidized bed with no harmful gaseous emissions by ensuring that the temperatures of both the bed and the freeboard are not lower than 900°C.
AB  - Industrijski tečni otpad može biti u obliku rastvora, suspenzija, mulja, pene, otpadnog ulja i generalno sadrži različite organske komponente. Predmet ovog rada je demonstracija tretmana tečnog otpada sa visokim sadržajem zagađujućih materija fabrike za proizvodnju pesticida metodom termičke destrukcije u fluidizovanom sloju peska kao tehnički praktične i optimalne tehnologije. Ispitivanja sagorevanja realnih tečnih otpadnih smeša fabrike pesticida su izvršena u poluindustrijskom-demonstracionom postrojenju, tj. u fluidizacionoj koloni sa slojem kvarcnog peska granulacije 0,63-1,25 mm i gustine 2610 kg/m3 na 800-950°C. U cilju obezbeđenja potpunog sagorevanja tečnog otpada, u fluidizacionu kolonu je uvođen vazduh u višku i odnos U/UmF (na temperaturi okoline) je iznosio između 1,1 i 2,3. U fluidizacionoj koloni se tečni otpad, dodatno tečno gorivo i vazduh mogu dovesti u stanje intenzivnog kontakta što omogućava stabilno i homogeno sagorevanje u sloju. Rezultati eksperimentalnih ispitivanja pokazuju da se u fluidizovanom sloju peska ostvaruje veoma dobra termička uniformnost i kontrola temperatura. Rezultati ispitivanja sagorevanja su pokazali da se tečni otpad sa visokim sadržajem zagađujućih materija može uspešno termički tretirati u fluidizovanom sloju peska bez emisije štetnih produkata sagorevanja, pod uslovom da su u sloju i iznad sloja obezbeđene temperature iznad 900°C.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Fluidized bed combustion of pesticide-manufacture liquid wastes
T1  - Sagorevanje tečnog otpada fabrike pesticida u fluidizovanom sloju
VL  - 75
IS  - 4
SP  - 523
EP  - 535
DO  - 10.2298/JSC090820024A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbavčić, Željko and Grbić, Boško and Radić, Nenad and Garić Grulović, Radmila and Miletic, Sasa and Savcic, Gordan and Dordevic, Bojana",
year = "2010",
abstract = "Industrial liquid wastes can be in the form of solutions, suspensions, sludges, scums or waste oil and have organic properties. The objective of this work was to demonstrate the technical feasibility of a fluidized bed as a clean technology for burning liquid waste from a pesticide production plant. The combustion of liquid waste mixtures, obtained from realistic samples, was investigated in a pilot scale fluidized bed with quartz sand particles of 0.63-1.25 mm in diameter and 2610 kg/m3 in density at 800-950°C. To ensure complete combustion of liquid waste and additional fuel, the combustion chamber was supplied with excess air and the U/UmF (at ambient temperature) was in between 1.1 and 2.3. In the fluidized bed chamber, liquid waste, additional liquid fuel and air can be brought into intense contact sufficient to permit combustion in bed without backfire problems. The experimental results show that the fluidized bed furnace offers excellent thermal uniformity and temperature control. The results of the combustion tests showed that degradation of liquid wastes can be successfully realized in a fluidized bed with no harmful gaseous emissions by ensuring that the temperatures of both the bed and the freeboard are not lower than 900°C., Industrijski tečni otpad može biti u obliku rastvora, suspenzija, mulja, pene, otpadnog ulja i generalno sadrži različite organske komponente. Predmet ovog rada je demonstracija tretmana tečnog otpada sa visokim sadržajem zagađujućih materija fabrike za proizvodnju pesticida metodom termičke destrukcije u fluidizovanom sloju peska kao tehnički praktične i optimalne tehnologije. Ispitivanja sagorevanja realnih tečnih otpadnih smeša fabrike pesticida su izvršena u poluindustrijskom-demonstracionom postrojenju, tj. u fluidizacionoj koloni sa slojem kvarcnog peska granulacije 0,63-1,25 mm i gustine 2610 kg/m3 na 800-950°C. U cilju obezbeđenja potpunog sagorevanja tečnog otpada, u fluidizacionu kolonu je uvođen vazduh u višku i odnos U/UmF (na temperaturi okoline) je iznosio između 1,1 i 2,3. U fluidizacionoj koloni se tečni otpad, dodatno tečno gorivo i vazduh mogu dovesti u stanje intenzivnog kontakta što omogućava stabilno i homogeno sagorevanje u sloju. Rezultati eksperimentalnih ispitivanja pokazuju da se u fluidizovanom sloju peska ostvaruje veoma dobra termička uniformnost i kontrola temperatura. Rezultati ispitivanja sagorevanja su pokazali da se tečni otpad sa visokim sadržajem zagađujućih materija može uspešno termički tretirati u fluidizovanom sloju peska bez emisije štetnih produkata sagorevanja, pod uslovom da su u sloju i iznad sloja obezbeđene temperature iznad 900°C.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Fluidized bed combustion of pesticide-manufacture liquid wastes, Sagorevanje tečnog otpada fabrike pesticida u fluidizovanom sloju",
volume = "75",
number = "4",
pages = "523-535",
doi = "10.2298/JSC090820024A"
}

Arsenijević, Z., Grbavčić, Ž., Grbić, B., Radić, N., Garić Grulović, R., Miletic, S., Savcic, G.,& Dordevic, B.. (2010). Fluidized bed combustion of pesticide-manufacture liquid wastes. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 75(4), 523-535.
https://doi.org/10.2298/JSC090820024A

Arsenijević Z, Grbavčić Ž, Grbić B, Radić N, Garić Grulović R, Miletic S, Savcic G, Dordevic B. Fluidized bed combustion of pesticide-manufacture liquid wastes. in Journal of the Serbian Chemical Society. 2010;75(4):523-535.
doi:10.2298/JSC090820024A .

Arsenijević, Zorana, Grbavčić, Željko, Grbić, Boško, Radić, Nenad, Garić Grulović, Radmila, Miletic, Sasa, Savcic, Gordan, Dordevic, Bojana, "Fluidized bed combustion of pesticide-manufacture liquid wastes" in Journal of the Serbian Chemical Society, 75, no. 4 (2010):523-535,
https://doi.org/10.2298/JSC090820024A . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
AU  - Garić Grulović, Radmila
AU  - Bošković-Vragolović, Nevenka
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/721
AB  - Experimental results were obtained on the steady settling of spheres in quiescent media in a range of cylindrical tubes to ascertain the wall effects over a relatively wide range of Reynolds number values. For practical considerations, the retardation effect is important when the ratio of the particle diameter to the tube diameter (lambda) is higher than about 0.05. A new empirical correlation is presented which covers a Reynolds number range Re = 53-15,100 and a particle to tube diameter ratio lambda LT 0.88. The absolute mean deviation between the experimental data and the presented correlation was 1.9%. The well-known correlations of Newton, Munroe and Di Felice agree with the presented data reasonably well. For steady settling of spheres in a counter-current water flow, the slip velocity remains practically the same as in quiescent media. However, for rising spheres in a co-current water flow, the slip velocity decreases with increasing co-current water velocity, i.e., the wall factor decreases with increasing co-current water velocity. Consequently, the drag coefficient for rising particles in co-current water flow increases with increasing water velocity.
PB  - Elsevier Science Sa, Lausanne
T2  - Powder Technology
T1  - Wall effects on the velocities of a single sphere settling in a stagnant and counter-current fluid and rising in a co-current fluid
VL  - 203
IS  - 2
SP  - 237
EP  - 242
DO  - 10.1016/j.powtec.2010.05.013
ER  - 

@article{
author = "Arsenijević, Zorana and Grbavčić, Željko and Garić Grulović, Radmila and Bošković-Vragolović, Nevenka",
year = "2010",
abstract = "Experimental results were obtained on the steady settling of spheres in quiescent media in a range of cylindrical tubes to ascertain the wall effects over a relatively wide range of Reynolds number values. For practical considerations, the retardation effect is important when the ratio of the particle diameter to the tube diameter (lambda) is higher than about 0.05. A new empirical correlation is presented which covers a Reynolds number range Re = 53-15,100 and a particle to tube diameter ratio lambda LT 0.88. The absolute mean deviation between the experimental data and the presented correlation was 1.9%. The well-known correlations of Newton, Munroe and Di Felice agree with the presented data reasonably well. For steady settling of spheres in a counter-current water flow, the slip velocity remains practically the same as in quiescent media. However, for rising spheres in a co-current water flow, the slip velocity decreases with increasing co-current water velocity, i.e., the wall factor decreases with increasing co-current water velocity. Consequently, the drag coefficient for rising particles in co-current water flow increases with increasing water velocity.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Powder Technology",
title = "Wall effects on the velocities of a single sphere settling in a stagnant and counter-current fluid and rising in a co-current fluid",
volume = "203",
number = "2",
pages = "237-242",
doi = "10.1016/j.powtec.2010.05.013"
}

Arsenijević, Z., Grbavčić, Ž., Garić Grulović, R.,& Bošković-Vragolović, N.. (2010). Wall effects on the velocities of a single sphere settling in a stagnant and counter-current fluid and rising in a co-current fluid. in Powder Technology
Elsevier Science Sa, Lausanne., 203(2), 237-242.
https://doi.org/10.1016/j.powtec.2010.05.013

Arsenijević Z, Grbavčić Ž, Garić Grulović R, Bošković-Vragolović N. Wall effects on the velocities of a single sphere settling in a stagnant and counter-current fluid and rising in a co-current fluid. in Powder Technology. 2010;203(2):237-242.
doi:10.1016/j.powtec.2010.05.013 .

Arsenijević, Zorana, Grbavčić, Željko, Garić Grulović, Radmila, Bošković-Vragolović, Nevenka, "Wall effects on the velocities of a single sphere settling in a stagnant and counter-current fluid and rising in a co-current fluid" in Powder Technology, 203, no. 2 (2010):237-242,
https://doi.org/10.1016/j.powtec.2010.05.013 . .

TY  - JOUR
AU  - Bošković-Vragolović, Nevenka
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Pjanović, Rada
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/523
AB  - A mass transfer coefficient between: A liquid and single sphere and a liquid And a column wall in packed and fluidized beds of a spherical inert Particle have been studied experimentally using the adsorption method. The experiments were conducted in a column 40 mm in diameter for packed and fluidized beds, and in a two-dimensional column 140 mm×10 mm for the flow past single sphere. In all runs, the mass transfer rates were determined in the presence of spherical glass particles, 3 mm in diameter, for packed and fluidized beds. The mass transfer data were obtained by studying transfer for flow past single sphere, 20 mm in diameter. This paper discusses the possibilities of application of the adsorption method for fluid flow visualization. Local and average mass transfer coefficients were determined from the color intensity of the surface of the foils of silica gel. Correlations, Sh = f(Re) and jD = f(Re), were derived using the mass transfer coefficient data.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - A mass transfer heterogeneous in systems by the adsorption method
VL  - 15
IS  - 1
SP  - 25
EP  - 28
DO  - 10.2298/CICEQ0901025B
ER  - 

@article{
author = "Bošković-Vragolović, Nevenka and Garić Grulović, Radmila and Grbavčić, Željko and Pjanović, Rada",
year = "2009",
abstract = "A mass transfer coefficient between: A liquid and single sphere and a liquid And a column wall in packed and fluidized beds of a spherical inert Particle have been studied experimentally using the adsorption method. The experiments were conducted in a column 40 mm in diameter for packed and fluidized beds, and in a two-dimensional column 140 mm×10 mm for the flow past single sphere. In all runs, the mass transfer rates were determined in the presence of spherical glass particles, 3 mm in diameter, for packed and fluidized beds. The mass transfer data were obtained by studying transfer for flow past single sphere, 20 mm in diameter. This paper discusses the possibilities of application of the adsorption method for fluid flow visualization. Local and average mass transfer coefficients were determined from the color intensity of the surface of the foils of silica gel. Correlations, Sh = f(Re) and jD = f(Re), were derived using the mass transfer coefficient data.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "A mass transfer heterogeneous in systems by the adsorption method",
volume = "15",
number = "1",
pages = "25-28",
doi = "10.2298/CICEQ0901025B"
}

Bošković-Vragolović, N., Garić Grulović, R., Grbavčić, Ž.,& Pjanović, R.. (2009). A mass transfer heterogeneous in systems by the adsorption method. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 15(1), 25-28.
https://doi.org/10.2298/CICEQ0901025B

Bošković-Vragolović N, Garić Grulović R, Grbavčić Ž, Pjanović R. A mass transfer heterogeneous in systems by the adsorption method. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2009;15(1):25-28.
doi:10.2298/CICEQ0901025B .

Bošković-Vragolović, Nevenka, Garić Grulović, Radmila, Grbavčić, Željko, Pjanović, Rada, "A mass transfer heterogeneous in systems by the adsorption method" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 15, no. 1 (2009):25-28,
https://doi.org/10.2298/CICEQ0901025B . .

TY  - CONF
AU  - Bošković-Vragolović, Nevenka
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Pjanović, Rada
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/573
AB  - Mass transfer coefficient (j D ) between fluid and column wall in liquid packed and fluidized beds of spherical inert particle has been studied experimentally using adsorption method. Experiments were conducted in column 40 mm in diameter for packed and fluidized beds. In all runs mass transfer rates were determined in presence of spherical glass particles 2.06 mm in diameter. This paper introduced adsorption method as very suitable method for studies of mass transfer and for fluid flow visualization. The adsorption method is based on the dynamic adsorption of an organic dye onto a surface covered with a thin layer of a porous adsorbent. Local and average mass transfer coefficients were determinated from the surface color intensity of the foils of silica gel. Correlation j D = f(Re) was derived using mass transfer coefficients data.
PB  - Maik Nauka/Interperiodica/Springer, New York
C3  - Russian Journal of Physical Chemistry A
T1  - Mass transfer and fluid flow visualization in packed and fluidized beds by the adsorption method
VL  - 83
IS  - 9
SP  - 1550
EP  - 1553
DO  - 10.1134/S0036024409090246
ER  - 

@conference{
author = "Bošković-Vragolović, Nevenka and Garić Grulović, Radmila and Grbavčić, Željko and Pjanović, Rada",
year = "2009",
abstract = "Mass transfer coefficient (j D ) between fluid and column wall in liquid packed and fluidized beds of spherical inert particle has been studied experimentally using adsorption method. Experiments were conducted in column 40 mm in diameter for packed and fluidized beds. In all runs mass transfer rates were determined in presence of spherical glass particles 2.06 mm in diameter. This paper introduced adsorption method as very suitable method for studies of mass transfer and for fluid flow visualization. The adsorption method is based on the dynamic adsorption of an organic dye onto a surface covered with a thin layer of a porous adsorbent. Local and average mass transfer coefficients were determinated from the surface color intensity of the foils of silica gel. Correlation j D = f(Re) was derived using mass transfer coefficients data.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Mass transfer and fluid flow visualization in packed and fluidized beds by the adsorption method",
volume = "83",
number = "9",
pages = "1550-1553",
doi = "10.1134/S0036024409090246"
}

Bošković-Vragolović, N., Garić Grulović, R., Grbavčić, Ž.,& Pjanović, R.. (2009). Mass transfer and fluid flow visualization in packed and fluidized beds by the adsorption method. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 83(9), 1550-1553.
https://doi.org/10.1134/S0036024409090246

Bošković-Vragolović N, Garić Grulović R, Grbavčić Ž, Pjanović R. Mass transfer and fluid flow visualization in packed and fluidized beds by the adsorption method. in Russian Journal of Physical Chemistry A. 2009;83(9):1550-1553.
doi:10.1134/S0036024409090246 .

Bošković-Vragolović, Nevenka, Garić Grulović, Radmila, Grbavčić, Željko, Pjanović, Rada, "Mass transfer and fluid flow visualization in packed and fluidized beds by the adsorption method" in Russian Journal of Physical Chemistry A, 83, no. 9 (2009):1550-1553,
https://doi.org/10.1134/S0036024409090246 . .

TY  - JOUR
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
AU  - Bošković-Vragolović, Nevenka
AU  - Arsenijević, Zorana
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/606
AB  - Wall-to-bed mass transfer in the hydraulic transport of spherical glass particles was studied. The experiments were performed by transporting spherical glass particles 1.20, 1.94 and 2.98 mm in diameter with water in a 25.4 mm I.D. tube. The mass transfer coefficients were determined by following rate of dissolution of a segment of the transport tube prepared from benzoic acid. In the runs in hydraulic transport, the Reynolds number of the tube varied between 1826 and 27597. The loading ratio (Gp/Gf) was between 0.026 and 0.474, and the fluid superficial velocity was between 0.267 · Ut and 4.904 · Ut, where Ut represents the single particle terminal velocity. For these ratios, the voidage ranged from 0.7123 to 0.9228. Also, wall-to-bed mass transfer in the single phase flow regime was studied. In the runs without particles, the Reynolds number of the tube varied between 122 and 39132. The data for the mass transfer factor (jD) in single phase flow are correlated for turbulent flow regime, using the Chilton-Colburn's type equations, jD = f(Re). Those investigations were conducted in aim to compare with results for wall-to-bed mass transfer in hydraulic transport. The data for wall-to-bed mass transfer (jD) in hydraulic transport of spherical particles were correlated by treating the flowing fluid-particle suspension as a pseudofluid, by introducing a modified suspension-wall friction coefficient (fw) and a modified Reynolds number (Rem). The data for wall-to-bed mass transfer in the hydraulic transport of particles show that an analogy between mass and momentum transfer exists.
T2  - Powder Technology
T1  - Mass transfer in vertical liquid-solids flow of coarse particles
VL  - 189
IS  - 1
SP  - 130
EP  - 136
DO  - 10.1016/j.powtec.2008.06.010
ER  - 

@article{
author = "Garić Grulović, Radmila and Grbavčić, Željko and Bošković-Vragolović, Nevenka and Arsenijević, Zorana",
year = "2009",
abstract = "Wall-to-bed mass transfer in the hydraulic transport of spherical glass particles was studied. The experiments were performed by transporting spherical glass particles 1.20, 1.94 and 2.98 mm in diameter with water in a 25.4 mm I.D. tube. The mass transfer coefficients were determined by following rate of dissolution of a segment of the transport tube prepared from benzoic acid. In the runs in hydraulic transport, the Reynolds number of the tube varied between 1826 and 27597. The loading ratio (Gp/Gf) was between 0.026 and 0.474, and the fluid superficial velocity was between 0.267 · Ut and 4.904 · Ut, where Ut represents the single particle terminal velocity. For these ratios, the voidage ranged from 0.7123 to 0.9228. Also, wall-to-bed mass transfer in the single phase flow regime was studied. In the runs without particles, the Reynolds number of the tube varied between 122 and 39132. The data for the mass transfer factor (jD) in single phase flow are correlated for turbulent flow regime, using the Chilton-Colburn's type equations, jD = f(Re). Those investigations were conducted in aim to compare with results for wall-to-bed mass transfer in hydraulic transport. The data for wall-to-bed mass transfer (jD) in hydraulic transport of spherical particles were correlated by treating the flowing fluid-particle suspension as a pseudofluid, by introducing a modified suspension-wall friction coefficient (fw) and a modified Reynolds number (Rem). The data for wall-to-bed mass transfer in the hydraulic transport of particles show that an analogy between mass and momentum transfer exists.",
journal = "Powder Technology",
title = "Mass transfer in vertical liquid-solids flow of coarse particles",
volume = "189",
number = "1",
pages = "130-136",
doi = "10.1016/j.powtec.2008.06.010"
}

Garić Grulović, R., Grbavčić, Ž., Bošković-Vragolović, N.,& Arsenijević, Z.. (2009). Mass transfer in vertical liquid-solids flow of coarse particles. in Powder Technology, 189(1), 130-136.
https://doi.org/10.1016/j.powtec.2008.06.010

Garić Grulović R, Grbavčić Ž, Bošković-Vragolović N, Arsenijević Z. Mass transfer in vertical liquid-solids flow of coarse particles. in Powder Technology. 2009;189(1):130-136.
doi:10.1016/j.powtec.2008.06.010 .

Garić Grulović, Radmila, Grbavčić, Željko, Bošković-Vragolović, Nevenka, Arsenijević, Zorana, "Mass transfer in vertical liquid-solids flow of coarse particles" in Powder Technology, 189, no. 1 (2009):130-136,
https://doi.org/10.1016/j.powtec.2008.06.010 . .

TY  - JOUR
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Arsenijević, Zorana
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/539
AB  - The deep oxidation of dimethylamine (DMA) was studied over Pt/Al2O3 catalysts with small (1 nm) and large (7.8-15.5 nm) Pt crystallite sizes. The turnover frequency (TOF) was higher for the large than for the small Pt crystallites, indicating that the reaction is structure sensitive. Two kinetic models were used to interpret the obtained results, i.e., the Mars van Krevelen and a mechanism based on the adsorption of oxygen and adsorption of dimethylamine on different active sites were employed. Both models showed that the activation energy for the oxygen chemisorption rate constant (k(o)) decreased with increasing of Pt crystallite size and that the activation energy for the surface reaction rate constant (k(i)) was independent of the Pt crystallite size. The structure sensitivity may be explained by differences in the reactivity of the oxygen adsorbed on these Pt crystallites. The Mars van Krevelen model fits the TOF values very well at concentrations of DMA higher than 1500 ppm, while in the lower concentrations region, the model under predicts the experimental data. The model based on the adsorption of oxygen and DMA on different active sites fits the experimental data quite well over the whole temperature and concentration range. The fitted values of the Henry adsorption constant are independent of the Pt crystallite size.
PB  - Elsevier
T2  - Applied Catalysis B-Environmental
T1  - Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts
VL  - 90
IS  - 3-4
SP  - 478
EP  - 484
DO  - 10.1016/j.apcatb.2009.04.008
ER  - 

@article{
author = "Grbić, Boško and Radić, Nenad and Arsenijević, Zorana and Garić Grulović, Radmila and Grbavčić, Željko",
year = "2009",
abstract = "The deep oxidation of dimethylamine (DMA) was studied over Pt/Al2O3 catalysts with small (1 nm) and large (7.8-15.5 nm) Pt crystallite sizes. The turnover frequency (TOF) was higher for the large than for the small Pt crystallites, indicating that the reaction is structure sensitive. Two kinetic models were used to interpret the obtained results, i.e., the Mars van Krevelen and a mechanism based on the adsorption of oxygen and adsorption of dimethylamine on different active sites were employed. Both models showed that the activation energy for the oxygen chemisorption rate constant (k(o)) decreased with increasing of Pt crystallite size and that the activation energy for the surface reaction rate constant (k(i)) was independent of the Pt crystallite size. The structure sensitivity may be explained by differences in the reactivity of the oxygen adsorbed on these Pt crystallites. The Mars van Krevelen model fits the TOF values very well at concentrations of DMA higher than 1500 ppm, while in the lower concentrations region, the model under predicts the experimental data. The model based on the adsorption of oxygen and DMA on different active sites fits the experimental data quite well over the whole temperature and concentration range. The fitted values of the Henry adsorption constant are independent of the Pt crystallite size.",
publisher = "Elsevier",
journal = "Applied Catalysis B-Environmental",
title = "Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts",
volume = "90",
number = "3-4",
pages = "478-484",
doi = "10.1016/j.apcatb.2009.04.008"
}

Grbić, B., Radić, N., Arsenijević, Z., Garić Grulović, R.,& Grbavčić, Ž.. (2009). Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts. in Applied Catalysis B-Environmental
Elsevier., 90(3-4), 478-484.
https://doi.org/10.1016/j.apcatb.2009.04.008

Grbić B, Radić N, Arsenijević Z, Garić Grulović R, Grbavčić Ž. Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts. in Applied Catalysis B-Environmental. 2009;90(3-4):478-484.
doi:10.1016/j.apcatb.2009.04.008 .

Grbić, Boško, Radić, Nenad, Arsenijević, Zorana, Garić Grulović, Radmila, Grbavčić, Željko, "Structure sensitivity of dimethylamine deep oxidation over Pt/Al2O3 catalysts" in Applied Catalysis B-Environmental, 90, no. 3-4 (2009):478-484,
https://doi.org/10.1016/j.apcatb.2009.04.008 . .

TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Garić Grulović, Radmila
AU  - Grbavčić, Željko
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/558
AB  - The dynamics of ethylene oxide sorption and desorption on Al2O3 sorbent were investigated. The investigations of ethylene oxide sorption on Al2O3 show that significant sorption appeared above 125°C. The removal of sorbed ethylene oxide from Al2O3 was achieved by continuous increasing of the temperature up to 450°C in air stream. The analysis of desorbed products show that 90% of adsorbed ethylene oxide is converted to CO2 and the rest consists of the three derivatives of ethylene oxide. The exact composition of desorbed organic products will be determined in further investigation. The desorption temperature profiles point out the presence of two exothermic picks, as was confirmed by detection of CO2 and derivates of ethylene oxide at these temperatures. Investigation of textural characteristics and thermal stability of Al2O3 sorbent show that there are no changes of any characteristics of Al2O3 in sorption/desorption operating temperatures regimes. Only at 700°C the specific surface area of Al2O3 decreases of about 10%. This indicates that the investigated Al2O3 is convenient material for removal of ethylene oxide by sorption.
AB  - U ovom radu prikazana su ispitivanja dinamike sorpcije i desorpcije etilen oksida na Al2O3 kao i sorpcioni kapaciteti, temperaturni režimi desorpcije i sastav produkata desorpcije etilen oksida. Rezultati su ukazali da sferni Al2O3 sorbent poseduje zadovoljavajuće sorpcione karakteristike za uklanjanje etilen oksida. Na temperaturama iznad 125°C ne dolazi do značajnog povećanja kapaciteta sorpcije etilen oksida. Produkti desorpcije etilen oksida sa Al2O3 sorbenta, postepenim povećanjem temperature u vazduhu, sadrže oko 90% CO2, a ostatak čine derivati etilen oksida. Ispitivanja teksturalnih karakteristika i termičke stabilnosti Al2O3 sorbenta pokazala su da u sorpciono/desorpcionom operativnom režimu nema nikakvih teksturalnih promena sorbenta. Ovo ukazuje da je ispitivana alumina pogodan materijal za sorpciono uklanjanje etilen oksida.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Ethylene oxide removal by sorption on aluminium oxide
T1  - Uklanjanje etilen oksida sorpcijom na aluminijum oksidu
VL  - 63
IS  - 4
SP  - 337
EP  - 343
DO  - 10.2298/HEMIND0904337A
ER  - 

@article{
author = "Arsenijević, Zorana and Grbić, Boško and Radić, Nenad and Garić Grulović, Radmila and Grbavčić, Željko",
year = "2009",
abstract = "The dynamics of ethylene oxide sorption and desorption on Al2O3 sorbent were investigated. The investigations of ethylene oxide sorption on Al2O3 show that significant sorption appeared above 125°C. The removal of sorbed ethylene oxide from Al2O3 was achieved by continuous increasing of the temperature up to 450°C in air stream. The analysis of desorbed products show that 90% of adsorbed ethylene oxide is converted to CO2 and the rest consists of the three derivatives of ethylene oxide. The exact composition of desorbed organic products will be determined in further investigation. The desorption temperature profiles point out the presence of two exothermic picks, as was confirmed by detection of CO2 and derivates of ethylene oxide at these temperatures. Investigation of textural characteristics and thermal stability of Al2O3 sorbent show that there are no changes of any characteristics of Al2O3 in sorption/desorption operating temperatures regimes. Only at 700°C the specific surface area of Al2O3 decreases of about 10%. This indicates that the investigated Al2O3 is convenient material for removal of ethylene oxide by sorption., U ovom radu prikazana su ispitivanja dinamike sorpcije i desorpcije etilen oksida na Al2O3 kao i sorpcioni kapaciteti, temperaturni režimi desorpcije i sastav produkata desorpcije etilen oksida. Rezultati su ukazali da sferni Al2O3 sorbent poseduje zadovoljavajuće sorpcione karakteristike za uklanjanje etilen oksida. Na temperaturama iznad 125°C ne dolazi do značajnog povećanja kapaciteta sorpcije etilen oksida. Produkti desorpcije etilen oksida sa Al2O3 sorbenta, postepenim povećanjem temperature u vazduhu, sadrže oko 90% CO2, a ostatak čine derivati etilen oksida. Ispitivanja teksturalnih karakteristika i termičke stabilnosti Al2O3 sorbenta pokazala su da u sorpciono/desorpcionom operativnom režimu nema nikakvih teksturalnih promena sorbenta. Ovo ukazuje da je ispitivana alumina pogodan materijal za sorpciono uklanjanje etilen oksida.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Ethylene oxide removal by sorption on aluminium oxide, Uklanjanje etilen oksida sorpcijom na aluminijum oksidu",
volume = "63",
number = "4",
pages = "337-343",
doi = "10.2298/HEMIND0904337A"
}

Arsenijević, Z., Grbić, B., Radić, N., Garić Grulović, R.,& Grbavčić, Ž.. (2009). Ethylene oxide removal by sorption on aluminium oxide. in Hemijska industrija
Association of Chemical Engineers of Serbia., 63(4), 337-343.
https://doi.org/10.2298/HEMIND0904337A

Arsenijević Z, Grbić B, Radić N, Garić Grulović R, Grbavčić Ž. Ethylene oxide removal by sorption on aluminium oxide. in Hemijska industrija. 2009;63(4):337-343.
doi:10.2298/HEMIND0904337A .

Arsenijević, Zorana, Grbić, Boško, Radić, Nenad, Garić Grulović, Radmila, Grbavčić, Željko, "Ethylene oxide removal by sorption on aluminium oxide" in Hemijska industrija, 63, no. 4 (2009):337-343,
https://doi.org/10.2298/HEMIND0904337A . .

TY  - JOUR
AU  - Grbavčić, Željko
AU  - Arsenijević, Zorana
AU  - Garić Grulović, Radmila
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/604
AB  - Single particle settling velocities through water fluidized beds of mono-sized glass spheres (dp = 0.645, 1.20, 1.94, 2.98 and 5 mm in diameter) were studied experimentally using a column, 40 mm in diameter. The settling spherical particles (Dp = 10 and 19.5 mm) had different densities (1237 to 8320 kg/m3), while the settling particles (Dp = 5 and 2.98 mm) were glass spheres. The pseudo-fluid model, which considers a liquid fluidized bed as a homogenous pseudo-fluid, predicts single particle settling velocities quite well if the ratio Dp/dp is larger than about 10. With decreasing ratio Dp/dp, the overall friction between the settling particle and the fluidized media increases. A method for predicting single particle settling velocities through a liquid fluidized bed is proposed and discussed. Following the approach of Van der Wielen et al. [L.A.M. Van der Wielen, M.H.H Van Dam, K.C.A.M. Van Luyben, On the relative motion of a particle in a swarm of different particles, Chem. Eng. Sci. 51 (2006) 995-1008], the overall friction is decomposed into a particle-fluid and a particle-particle component. The effective buoyancy force is calculated using the transition function proposed by Ruzicka [M.C. Ruzicka, On buoyancy in dispersion, Chem. Eng. Sci. 61 (2006) 2437-2446]. A simple model for predicting the collision force is proposed, as well as a correlation for the collision coefficient. The mean absolute deviation between the experimental and calculated slip velocities was 5.08%.
T2  - Powder Technology
T1  - Prediction of single particle settling velocities through liquid fluidized beds
VL  - 190
IS  - 3
SP  - 283
EP  - 291
DO  - 10.1016/j.powtec.2008.08.005
ER  - 

@article{
author = "Grbavčić, Željko and Arsenijević, Zorana and Garić Grulović, Radmila",
year = "2009",
abstract = "Single particle settling velocities through water fluidized beds of mono-sized glass spheres (dp = 0.645, 1.20, 1.94, 2.98 and 5 mm in diameter) were studied experimentally using a column, 40 mm in diameter. The settling spherical particles (Dp = 10 and 19.5 mm) had different densities (1237 to 8320 kg/m3), while the settling particles (Dp = 5 and 2.98 mm) were glass spheres. The pseudo-fluid model, which considers a liquid fluidized bed as a homogenous pseudo-fluid, predicts single particle settling velocities quite well if the ratio Dp/dp is larger than about 10. With decreasing ratio Dp/dp, the overall friction between the settling particle and the fluidized media increases. A method for predicting single particle settling velocities through a liquid fluidized bed is proposed and discussed. Following the approach of Van der Wielen et al. [L.A.M. Van der Wielen, M.H.H Van Dam, K.C.A.M. Van Luyben, On the relative motion of a particle in a swarm of different particles, Chem. Eng. Sci. 51 (2006) 995-1008], the overall friction is decomposed into a particle-fluid and a particle-particle component. The effective buoyancy force is calculated using the transition function proposed by Ruzicka [M.C. Ruzicka, On buoyancy in dispersion, Chem. Eng. Sci. 61 (2006) 2437-2446]. A simple model for predicting the collision force is proposed, as well as a correlation for the collision coefficient. The mean absolute deviation between the experimental and calculated slip velocities was 5.08%.",
journal = "Powder Technology",
title = "Prediction of single particle settling velocities through liquid fluidized beds",
volume = "190",
number = "3",
pages = "283-291",
doi = "10.1016/j.powtec.2008.08.005"
}

Grbavčić, Ž., Arsenijević, Z.,& Garić Grulović, R.. (2009). Prediction of single particle settling velocities through liquid fluidized beds. in Powder Technology, 190(3), 283-291.
https://doi.org/10.1016/j.powtec.2008.08.005

Grbavčić Ž, Arsenijević Z, Garić Grulović R. Prediction of single particle settling velocities through liquid fluidized beds. in Powder Technology. 2009;190(3):283-291.
doi:10.1016/j.powtec.2008.08.005 .

Grbavčić, Željko, Arsenijević, Zorana, Garić Grulović, Radmila, "Prediction of single particle settling velocities through liquid fluidized beds" in Powder Technology, 190, no. 3 (2009):283-291,
https://doi.org/10.1016/j.powtec.2008.08.005 . .