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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

STUDY OF THE EFFECT OF WALL BOUNDARY CONDITIONS ON THE PREDICTIONS OF THE LIQUID-SOLID FLOWS IN FLUIDIZED BEDS

M. Daval
Department of Energy and Environment National Institute of Applied Sciences (INSA), Lyon, France

Chao Zhang
Department of Mechanical and Materials Engineering The University of Western Ontario, London, ON, Canada N6A 5B9

L. Kong
Mechanical designer, Ottawa, Canada

Abstract

In this study, CFD simulations of the liquid-solid two-phase flow in a LSCFB down-comer were carried to study the influence of restitution coefficient and specularity coefficient on the numerical results. The numerical results were compared with the experimental data. Thus, the correct values for these parameters can be used in order to increase the accuracy of the numerical prediction. It has been found that the specularity coefficient has a strong impact on the solid particle distribution near the wall. When this coefficient is high, the core-annulus structure is not even observed in certain zones. The restitution coefficient e=0.99 gives most accurate results. Overall, the solids volume fraction is more sensitive to the specularity coefficient than the restitution coefficient.

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