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RESEARCH PAPERS: Boiling and Condensation

Stability of Condensation on Horizontal Surfaces With Noncondensables Present

[+] Author and Article Information
P. F. Peterson, I. J. Rao

Department of Nuclear Engineering, University of California, Berkeley, CA 94720-1730

J. Heat Transfer 117(4), 1003-1010 (Nov 01, 1995) (8 pages) doi:10.1115/1.2836274 History: Received July 01, 1994; Revised June 01, 1995; Online January 23, 2008

Abstract

This work studies condensation on horizontal surfaces in the presence of noncondensable gases using linear stability analysis to determine when one-dimensional flow will bifurcate to a higher-order flow due to an adverse density gradient. The problem is solved for the simple single-diffusive case and for the double-diffusive case where the density also depends on either a temperature gradient or a second noncondensable gas species. For the single-diffusive case critical Rayleigh numbers and gas layer thicknesses are obtained for a wide range of Schmidt numbers. Using these results, the quantity of noncondensable required to destabilize a horizontal system can be calculated, and usually will be found to be small.

Copyright © 1995 by The American Society of Mechanical Engineers
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