Stability and Heat Transfer Characteristics of Condensate Fluid Layers in Reduced Gravity

James C. Hermanson, Worcester Polytechnic Institute
Andreas N. Alexandrou, Worcester Polytechnic Institute
William W. Durgin, Worcester Polytechnic Institute
Peder C. Pedersen, Worcester Polytechnic Institute
Jeffrey S. Allen, National Center for Microgravity Research

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NOTE: At the time of publication, the author William W. Durgin was affiliated with Worcester Polytechnic Institute. Currently, March 2008, he is Provost and Vice President of Academic Affairs at California Polytechnic State University - San Luis Obispo.

Abstract

The focus of this ground-based program is the study of film condensation phenomena under variable, reduced-gravity conditions. Experimental tests, combined with numerical modeling, are employed to gain an improved understanding of the fundamental fluid physics responsible for condensate film growth, film instability and the resulting interfacial motion under variable gravity, and the corresponding implications for heat transfer. There has been relatively little research on the mechanisms operative at the film interface between condensed liquid and its vapor under reduced gravity conditions. Of particular interest are the stability characteristics of the condensate layer, and how they differ from those of films of comparable scale in the absence of condensation.