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Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow

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

Keywords:
Co-current gas-solid flow / Downer / Hydrodynamic modeling
Source:
Powder Technology, 2014, 256, 416-427
Publisher:
  • Elsevier, 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.2014.01.091

ISSN: 0032-5910

WoS: 000335097600050

Scopus: 2-s2.0-84896393169
[ Google Scholar ]
6
5
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2859
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Arsenijević, Zorana
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Garić-Grulović, Radmila
AU  - Đuriš, Mihal
AU  - Grbavčić, Željko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2859
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, Amsterdam
T2  - Powder Technology
T1  - Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow
EP  - 427
SP  - 416
VL  - 256
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, Amsterdam",
journal = "Powder Technology",
title = "Hydrodynamic modeling of downward gas-solid flow. Part II: Co-current flow",
pages = "427-416",
volume = "256",
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, Amsterdam., 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 . .

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