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RESEARCH PAPERS

Transient Radiative Cooling of a Layer Filled With Solidifying Drops

[+] Author and Article Information
R. Siegel

NASA Lewis Research Center, Cleveland, OH 44135

J. Heat Transfer 109(4), 977-982 (Nov 01, 1987) (6 pages) doi:10.1115/1.3248213 History: Received August 14, 1986; Online October 20, 2009

Abstract

An analysis is carried out for radiative cooling of a plane layer initially filled with liquid drops that solidify and then continue to cool by loss of sensible heat. This is in connection with a proposed lightweight radiator system for heat dissipation in space. Hot liquid drops would be ejected and then cooled by direct exposure in space; they would then pass into a collector for reuse. The cooling analysis contains three transient zones. In the first, the drops cool by losing latent heat until the outermost drops become solid. Then the cooling continues by loss of both latent and sensible heat. Finally, all of the drops are solid, and they continue to cool by loss of sensible heat. A similarity behavior is eventually achieved in which the transient emittance of the layer depends only on the optical thickness.

Copyright © 1987 by ASME
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