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9 - Heat and mass transfer

Published online by Cambridge University Press:  04 February 2011

By
Andrzej Kmiec  and
Sebastian Englart
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

A great number of processes carried out in spouted beds require the application of different modes of heat and/or mass transfer. We may distinguish among the following modes:

  • Heat transfer, mass transfer, simultaneous heat and mass transfer – between fluid and particles,

  • Heat transfer between wall and bed, and

  • Heat transfer between submerged object and bed.

For each mode, transfer mechanisms are examined; then experimental findings and, in some cases, theoretical studies are discussed.

Between fluid and particles

Transfer mechanisms and models

Quite often, the basic assumption for analysis of heat or mass exchanged between fluid and particles is that heat is transferred to the particles under conditions of external control, neglecting heat transmission within the particles. For heat transfer in the absence of mass transfer, this is justified when the particle heat transfer Biot number is sufficiently small (e.g., <0.1) and the corresponding Fourier number exceeds 0.22. For simultaneous heat and mass transfer, such as when the particles are well wetted at the surface, the average temperature at the particle surfaces is substantially uniform, and external control again prevails.

Assuming plug flow conditions through the bed, the axial fluid temperature distribution can be described by a dimensionless function. Because the spouted bed consists of two distinct regions, with the average gas velocity in the spout being one or two orders of magnitude greater than that in the annulus, the decline of gas temperature in these two zones is quite different; it is slight in the spout and considerable in the annular zone.

Type
Chapter
Information
Spouted and Spout-Fluid Beds
Fundamentals and Applications
 , pp. 161 - 174
Publisher: Cambridge University Press
Print publication year: 2010

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