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TECHNICAL BRIEFS

Effects of Surface Tension and Binary Diffusion on Pool Boiling of Dilute Solutions: An Experimental Assessment

[+] Author and Article Information
S. G. Kandlikar, L. Alves

Mechanical Engineering Department, Rochester Institute of Technology, Rochester, NY 14623

J. Heat Transfer 121(2), 488-493 (May 01, 1999) (6 pages) doi:10.1115/1.2826008 History: Received October 26, 1997; Revised January 13, 1999; Online December 05, 2007

Abstract

Pool boiling heat transfer with dilute binary mixtures introduces two additional effects due to binary diffusion, and due to change in the surface tension. The secondary effects due to changes in contact angle and wetting characteristics may also play a role. The present study focuses on identifying these effects for dilute aqueous solutions of ethylene glycol. Pool boiling experiments are conducted to generate data in the range of one to ten percent mass fraction. It is found that in the low concentration region, the binary diffusion effects are insignificant for aqueous solutions of ethylene glycol, and a slight improvement in heat transfer coefficient is observed over the pure water value. The binary diffusion effects are related to a volatility parameter, V1 . The heat transfer coefficient does not degrade in the region where V1 < 0.03, and the surface tension does not change appreciably compared to pure water value. This points to the possibility that the changes in contact angle and wetting characteristics play an important role in the pool boiling heat transfer.

Copyright © 1999 by The American Society of Mechanical Engineers
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