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RESEARCH PAPERS

An Analytical Model of Thermal and Vapor Diffusion in Freezing of Wet Coal

[+] Author and Article Information
D. B. Moog, B. Rubinsky

Department of Mechnical Engineering, University of California, Berkeley, Calif. 94720

J. Heat Transfer 107(1), 5-11 (Feb 01, 1985) (7 pages) doi:10.1115/1.3247403 History: Received January 30, 1984; Online October 20, 2009

Abstract

An analytical study is presented for the freezing of a semi-infinite domain of wet coal particles with special attention to the role of the airborne water vapor diffusion process. The results indicate that energy transport in this multiphase system can occur by means of thermal diffusion or mass diffusion. The magnitude of the Lewis number can be used to determine the mechanism. For a Lewis number smaller than 1, water vapor will evaporate from the coal particles, condense on the wall, and increase the freezing rate in the system.

Copyright © 1985 by ASME
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