Heat Transfer During Evaporation on Capillary-Grooved Structures of Heat Pipes

[+] Author and Article Information
D. Khrustalev, A. Faghri

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269

J. Heat Transfer 117(3), 740-747 (Aug 01, 1995) (8 pages) doi:10.1115/1.2822638 History: Received May 01, 1994; Revised January 01, 1995; Online December 05, 2007


A detailed mathematical model is developed that describes heat transfer through thin liquid films in the evaporator of heat pipes with capillary grooves. The model accounts for the effects of interfacial thermal resistance, disjoining pressure, and surface roughness for a given meniscus contact angle. The free surface temperature of the liquid film is determined using the extended Kelvin equation and the expression for interfacial resistance given by the kinetic theory. The numerical results obtained are compared to existing experimental data. The importance of the surface roughness and interfacial thermal resistance in predicting the heat transfer coefficient in the grooved evaporator is demonstrated.

Copyright © 1995 by The American Society of Mechanical Engineers
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