期刊
PARTICUOLOGY
卷 13, 期 -, 页码 114-123出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2013.04.007
关键词
CFD; Circulating fluidized bed; Gas-solids two-phase flow; Wall boundary condition; Specularity coefficient; Particle-wall restitution coefficient
A computational fluid dynamics (CFD) modeling of the gas-solids two-phase flow in a circulating fluidized bed (CFB) riser is carried out. The Eularian-Eularian method with the kinetic theory of granular flow is used to solve the gas-solids two-phase flow in the CFB riser. The wall boundary condition of the riser is defined based on the Johnson and Jackson wall boundary theory (Johnson & Jackson, 1987) with specularity coefficient and particle-wall restitution coefficient, The numerical results show that these two coefficients in the wall boundary condition play a major role in the predicted solids lateral velocity, which affects the solid particle distribution in the CFB riser. And the effect of each of the two coefficients on the solids distribution also depends on the other one. The generality of the CFD model is further validated under different operating conditions of the CFB riser. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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