Two-fluid modeling of Geldart A particles in gas–solid micro-fluidized beds--颗粒学报PARTICUOLOGY

Liu, X., Zhu, C., Geng, S., Yao, M., Zhan, J., & Xu, G. (2015). Two-fluid modeling of Geldart A particles in gas–solid micro-fluidized beds. Particuology, 21, 118-127. https://doi.org/10.1016/j.partic.2014.05.012

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

Xiaoxing Liu ^a *, Chuanqiang Zhu ^{a b}, Shujun Geng ^{a b}, Meiqin Yao ^a, Jinhui Zhan ^a, Guangwen Xu ^a *

a State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China
b University of Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2014.05.012

Volume 21, August 2015, Pages 118-127

Received 10 January 2014, Revised 21 May 2014, Accepted 27 May 2014, Available online 8 November 2014, Version of Record 6 June 2015.

E-mail: xxliu@home.ipe.ac.cn; gwxu@home.ipe.ac.cn

Highlights

• Fluidization behavior of Geldart A particles in micro fluidized bed was simulated by CFD.

• Minimum bubbling velocity and voidage predicted by Gibilaro model agreed with experimental data.

• Solids-wall boundary conditions had substantial impact on flow behavior of gas and solids.

Abstract

The fluidization 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.

Graphical abstract

Keywords

Micro-fluidized bed; Geldart A particle; Two-fluid model; Boundary condition; Drag model

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