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RESEARCH PAPERS: Heat Conduction

A Thermal Barrier With Adaptive Heat Transfer Characteristics

[+] Author and Article Information
P. Furmanski, J. M. Floryan

Department of Mechanical Engineering, The University of Western Ontario, London, Ontario N6A5B9, Canada

J. Heat Transfer 116(2), 302-310 (May 01, 1994) (9 pages) doi:10.1115/1.2911400 History: Received May 01, 1992; Revised June 01, 1993; Online May 23, 2008

Abstract

A thermal barrier with adaptive heat transfer characteristics for applications in zero gravity environments is considered. The barrier consists of a mixture of fluid with a small volume fraction of arbitrarily oriented, randomly distributed particles of ellipsoidal shape. Heat flux control is obtained by changing the orientation of the particles. Heat flow may be increased up to several hundred times by rotating the particles from being parallel to the walls to being transverse to the walls and by increasing their aspect ratio, volume fraction, and relative thermal conductivity. An increase in the size of the particles results in the appearance of wall effects, which may substantially reduce heat flow as compared to the case of an infinite medium. Very large temperature variation is found to occur near the walls where an apparent “slip” of temperature occurs for barriers whose thickness is large compared to the particle size.

Copyright © 1994 by The American Society of Mechanical Engineers
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