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Evaluation of the effect of wall boundary conditions on numerical simulations of circulating fluidized beds
Authors:Lei Kong  ;Chao Zhang  ;Jesse Zhu
Institution:[1]Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, N6A 5B9, Canada; [2]Department of Chemical and Biochemical Engineering, The Universily of Western Ontario, London, Ontario, N6A 5B9, Canada
Abstract: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' n 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.
Keywords:CFD Circulating fluidized bed Gas-solids two-phase flowWall boundary conditionSpecularity coefficientParticle-wall restitution coefficient
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