Evaluation of the effect of wall boundary conditions on numerical simulations of circulating fluidized beds

作     者：Lei Kong Chao Zhang Jesse Zhu 

作者机构：Department of Mechanical and Materials EngineeringThe University of Western OntarioLondonOntarioN6A 5B9Canada Department of Chemical and Biochemical EngineeringThe University of Western OntarioLondonOntarioN6A 5B9Canada 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2014年第12卷第2期

页      面：114-123页

核心收录：

学科分类：080706[工学-化工过程机械] 080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 

主　　题：CFD Circulating fluidized bed Gas solids two phase flowWall boundary conditionSpecularity coefficientParticle wall restitution coefficient 

摘      要：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 *** 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 operatin~ conditions of the CFB riser.