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4 - Computational fluid dynamic modeling of spouted beds

Published online by Cambridge University Press:  04 February 2011

By
Xiaojun Bao ,
Wei Du  and
Jian Xu
Edited by
Norman Epstein  and
John R. Grace
Norman Epstein
Affiliation:
University of British Columbia, Vancouver
John R. Grace
Affiliation:
University of British Columbia, Vancouver
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Summary

Introduction

As reviewed in Chapter 3, numerous theoretical and experimental studies have been carried out in recent decades in an attempt to model the hydrodynamics of spouted beds. Most of the early models are one-dimensional, with spout and annulus considered separately by assuming that some parameters are constant. In addition, these models, though useful as first approximations, are complex, or require parameters to be determined by experiments.

Thanks to the explosion of computational power, the advance of numerical algorithms, and deeper understanding of multiphase flow phenomena, computational fluid dynamics (CFD) modeling has become a powerful tool for understanding dense gas–solid two-phase flows in the recent past. The main advantage of CFD modeling is that a wide range of flow properties of the gas and solids may be predicted simultaneously without disturbing the flows.

Currently, there are two main CFD approaches: the Eulerian-Eulerian approach (two-fluid model, TFM), and the Eulerian-Lagrangian (discrete element method, DEM) approach. In the following two sections, the fundamentals and applications of these two approaches in hydrodynamic modeling of spouted beds are treated separately. In each section, the main aspects of the CFD approach are introduced briefly, followed by application to modeling of spouted bed hydrodynamics. Comparison of the CFD predictions with experimental results is also discussed.

Type
Chapter
Information
Spouted and Spout-Fluid Beds
Fundamentals and Applications
 , pp. 57 - 81
Publisher: Cambridge University Press
Print publication year: 2010

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