0
RESEARCH PAPERS

Heat and Mass Transfer in Fixed Beds at Low Reynolds Numbers

[+] Author and Article Information
L. R. Glicksman, F. M. Joos

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass. 02139

J. Heat Transfer 102(4), 736-741 (Nov 01, 1980) (6 pages) doi:10.1115/1.3244382 History: Received January 15, 1980; Online October 20, 2009

Abstract

In a fixed or fluidized bed at low particle Reynolds numbers, the overall or effective Sherwood and Nusselt number has been found by many investigators to be much less than unity. The limiting value of the particle Sherwood or Nusselt number based on local concentration or temperature differences is shown to be equal to or greater than unity. An analytical model was established using realistic packed bed geometries to allow for diffusion in the flow direction, channeling due to nonuniformities in bed voidage and different particle sizes, and inaccuracies in the experimental measurements. The predicted values of the effective Sherwood and Nusselt numbers are found to agree closely with experimental measurements for gases and liquids. Diffusion is shown to be the primary mechanism for the fall-off in the effective bed characteristics.

Copyright © 1980 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In