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RESEARCH PAPERS: Boiling and Condensation

On the Role of Marangoni Effects on the Critical Heat Flux for Pool Boiling of Binary Mixtures

[+] Author and Article Information
W. R. McGillis, V. P. Carey

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Heat Transfer 118(1), 103-109 (Feb 01, 1996) (7 pages) doi:10.1115/1.2824021 History: Received September 01, 1994; Revised October 01, 1995; Online December 05, 2007

Abstract

The Marangoni effect on the critical heat flux (CHF) condition in pool boiling of binary mixtures has been identified and its effect has been quantitatively estimated with a modified model derived from hydrodynamics. The physical process of CHF in binary mixtures, and models used to describe it, are examined in the light of recent experimental evidence, accurate mixture properties, and phase equilibrium revealing a correlation to surface tension gradients and volatility. A correlation is developed from a heuristic model including the additional liquid restoring force caused by surface tension gradients. The CHF condition was determined experimentally for saturated methanol/water, 2-propanol/water, and ethylene glycol/water mixtures, over the full range of concentrations, and compared to the model. The evidence in this study demonstrates that in a mixture with large differences in surface tension, there is an additional hydrodynamic restoring force affecting the CHF condition.

Copyright © 1996 by The American Society of Mechanical Engineers
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