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RESEARCH PAPERS: Heat Exchangers

EHD Enhanced Convective Boiling of R-134a in Grooved Channels—Application to Subcompact Heat Exchangers

[+] Author and Article Information
M. Salehi, M. M. Ohadi, S. Dessiatoun

Heat Transfer Enhancement Laboratory, Center for Environmental Energy Engineering, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Heat Transfer 119(4), 805-809 (Nov 01, 1997) (5 pages) doi:10.1115/1.2824186 History: Received March 25, 1996; Revised July 15, 1997; Online December 05, 2007

Abstract

Electrohydrodynamically (EHD) enhanced flow boiling of refrigerant R-134a inside grooved channels of approximately 1-mm hydraulic diameter was investigated with the objective of addressing the applicability of the EHD technique in highly compact heat exchangers. Two sets of experiments were performed. The first set included experiments in a channel with a smooth heat transfer wall, whereas in the second set a corrugated (enhanced) surface was used. In each case experiments were conducted as a function of the applied electrical field strength, electric field polarity, flow Reynolds number, inlet test section vapor quality, and flow direction (upward, downward, or horizontal). It is demonstrated that in all cases the EHD effect can substantially increase the heat transfer coefficient particularly at low Reynolds numbers and when applied over the enhanced heat transfer wall.

Copyright © 1997 by The American Society of Mechanical Engineers
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