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Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles

Authorized Users Only
2014
Authors
Kaluđerović-Radoičić, Tatjana
Đuriš, Mihal
Garić-Grulović, Radmila
Arsenijević, Zorana
Grbavčić, Željko
Article (Published version)
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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 co...efficients 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.

Keywords:
Water fluidized bed / Spherical particles / Overall circulation rate / Frequency of collisions / Transport properties intensity
Source:
Powder Technology, 2014, 253, 295-303
Publisher:
  • Elsevier Science Bv, Amsterdam
Funding / projects:
  • The development of efficient chemical-engineering processes based on the transport phenomena research and process intensification principles (RS-172022)

DOI: 10.1016/j.powtec.2013.11.038

ISSN: 0032-5910

WoS: 000332430600041

Scopus: 2-s2.0-84890611610
[ Google Scholar ]
5
3
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2774
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Đuriš, Mihal
AU  - Garić-Grulović, Radmila
AU  - Arsenijević, Zorana
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2774
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 Science Bv, Amsterdam
T2  - Powder Technology
T1  - Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles
EP  - 303
SP  - 295
VL  - 253
DO  - 10.1016/j.powtec.2013.11.038
UR  - conv_4370
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 Science Bv, Amsterdam",
journal = "Powder Technology",
title = "Solid circulation rate and particle collisions in quasi two-dimensional water fluidized beds of spherical particles",
pages = "303-295",
volume = "253",
doi = "10.1016/j.powtec.2013.11.038",
url = "conv_4370"
}
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 Science Bv, Amsterdam., 253, 295-303.
https://doi.org/10.1016/j.powtec.2013.11.038
conv_4370
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
conv_4370 .
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 .,
conv_4370 .

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