Two-fluid modeling of Geldart A particles in gas-solid micro-fluidized beds

The fiuidization behavior of Geldart A particles in a gas-solid micro-fluidized bed was investigated by Eulerian-Eulerian numerical simulation. The commonly used Gidaspow drag model was tested first. The simulation showed that the predicted minimum bubbling velocities were significantly lower than t...

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Bibliographic Details
Published in:Particuology 2015-08, Vol.21 (4), p.118-127
Main Authors: Liu, Xiaoxing, Zhu, Chuanqiang, Geng, Shujun, Yao, Meiqin, Zhan, Jinhui, Xu, Guangwen
Format: Article
Language:English
Subjects:
Boundary condition
Drag model
Geldart A particle
Micro-fluidized bed
Two-fluid model
两流体模型
实验数据
床层空隙率
数值模拟
气固流化床
阻力模型
颗粒
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Summary:The fiuidization behavior of Geldart A particles in a gas-solid micro-fluidized bed was investigated by Eulerian-Eulerian numerical simulation. The commonly used Gidaspow drag model was tested first. The simulation showed that the predicted minimum bubbling velocities were significantly lower than the experimental data even when an extremely fine grid size （of approximately one particle diameter） was used. The modified Gibilaro drag model was therefore tested next. The predicted minimum bubbling velocity and bed voidage were in reasonable agreement with the experimental data available in literature. The experimentally observed regime transition phenomena from bubbling to slugging were also reproduced successfully in the simulations. Parametric studies indicated that the solid-wall boundary conditions had a significant impact on the predicted gas and solid flow behavior.
ISSN:1674-2001
2210-4291
DOI:10.1016/j.partic.2014.05.012