Characteristics of Mixing/Segregation in a Bubbling/Slugging Fluidized Bed with Binary Mixtures

Chen, Heng Zhi; Guo, Zheng

doi:10.4028/www.scientific.net/amr.396-398.322

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…There are several experimental (Wu and Baeyens, 1998;Gibilaro and Rowe, 1974;Nienow et al, 1978;Garcia-Ochoa et al, 1989;Rasul et al, 1999;Marzocchella et al, 2000;Jang et al, 2010;Chen and Guo, 2011;Oshitani et al, 2013;Tabrizi et al, 2013) or numerical (Rhodes et al, 2001;Gera and Syamlal, 2004;Feng et al, 2004;Dahl and Hrenya, 2005;Feng and Yu, 2006;Norouzi et al, 2012a;Alavi Shoushtari et al, 2013;Amiri and Movahedirad, 2017;Gosavi et al, 2018;Fan et al, 2018) studies for investigating the mixing or segregation of fluidized beds of solid particles. Gibilaro and Rowe (1974) presented a model for the solid particles concentration as a function of the bed height and validated this model by using their experimental investigations.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the particles segregation phenomenon in the fluidized beds

Karami

Goharrizi

Abolpour

et al. 2019

MMMS

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Purpose The purpose of this paper is to present a computational fluid dynamic simulation for the investigation of the particles segregation phenomenon in the gas–solid fluidized beds. Design/methodology/approach These particles have the same size and different densities. The k–ε model and multiphase particle-in-cell method have been utilized for modeling the turbulent fluid flow and solid particles behaviors, respectively. The coupled equations of the velocity and pressure have been solved by using a combination of SIMPLE and PISO algorithms. After validating the simulation, different mixing indices, with different calculation bases, have been investigated, and it has been found that the Lacey mixing index, which was defined based on statistical concepts, is suitable to investigate the segregation/mixing phenomena of this bed in different conditions. Finally, the effects of parameters such as velocity, particle density ratio, jetsam concentration, and initial arrangement on the segregation/mixing behaviors of the bed have been studied. Findings The results show that the increase in the superficial gas velocity decreases the mixing index to a minimum value and then increases this index in the beds with mixed initial condition, unlike the beds with separated initial condition. Moreover, an increase in the particle density ratio increases the minimum fluidization velocity of the bed, and also the amount of segregation, and increase in the jetsam concentration increases the value of the mixing index. Originality/value A computational fluid dynamics simulation has been presented for the particles segregation phenomenon in the gas–solid fluidized beds.

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