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Numerical simulation of discrete particles in fluidized bed with immersed tube
REN Li-bo1,2, HAN Ji-tian1, ZHAO Hong-xia1
1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China; 2. Shanghai Heat Transfer Equipment Limited Company, Shanghai 201508, China
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The parallel technique for computational fluid dynamics-discrete element method (CFD-DEM) coupling model was developed through user defined functions (UDFs) in the framework of secondary development based on message passing interface (MPI) platform of FLUENT software. The algorithm has good scalability and speed-up performance with the increase in the number of computing nodes. Numerical simulation of the particle mixing processes in the fluidized bed with immersed tube was conducted by the developed parallel CFD-DEM coupling model. The gas-solid hydrodynamics and particle mixing mechanism were explored, and the erosion properties of the immersed tube were surveyed. Simulation results show that the immersed tube causes bubble coalescence and breakage. The preferential path of bubble motion mainly lies around the tube rather than near the walls. The radial distribution of bubble phase becomes more homogeneous with superficial gas velocity increasing. The radial heterogeneities of the solid flow and distribution are exhibited. Both of the existence of immersed tube and the increase in superficial gas velocity are helpful for particle mixing and for decrease in the time for full mixing status. The erosion quantity mainly depends on the impact frequency and particle velocity.

Published: 06 June 2018
CLC:  TK 121  
Cite this article:

REN Li-bo, HAN Ji-tian, ZHAO Hong-xia. Numerical simulation of discrete particles in fluidized bed with immersed tube. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(1): 150-156.

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