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RESEARCH PAPERS: Micro-Scale Heat Transfer

Transient Thermocapillary Flows Induced by a Droplet Translating in an Electric Field

[+] Author and Article Information
Chun-Liang Lai, Wen-Lang Tang

Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 106, R.O.C

J. Heat Transfer 120(3), 752-757 (Aug 01, 1998) (6 pages) doi:10.1115/1.2824345 History: Received October 10, 1997; Revised March 16, 1998; Online December 05, 2007

Abstract

A spherical dielectric droplet translating steadily in another dielectric liquid with a uniform electric field imposed in the translational direction of the droplet is studied theoretically. With the small Reynolds number and large Peclet number assumptions, analytic solutions are obtained for the stream function with a term involving the interfacial temperature distribution which is then computed numerically. The results indicate that the interfacial temperature distribution is indeed nonuniform and the thermocapillarity might exist thereby. The induced thermocapillary flows in the droplet are usually of multiple cells with which the heat transfer rate may increases or decreases depending on whether the original flow is enhanced or suppressed. For the example calculated in the present study, the heat transfer rate is decreased by the thermocapillary effect.

Copyright © 1998 by The American Society of Mechanical Engineers
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