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RESEARCH PAPERS: Boiling and Two-Phase Heat Transfer

An Experimental Investigation of the Effects of Subcooling and Velocity on Boiling of Freon-113

[+] Author and Article Information
L. Huang, L. C. Witte

Heat Transfer and Phase Change Laboratory, Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4792

J. Heat Transfer 118(2), 436-441 (May 01, 1996) (6 pages) doi:10.1115/1.2825863 History: Received January 01, 1995; Revised February 01, 1996; Online December 05, 2007

Abstract

Boiling heat transfer correlations were obtained for the maximum and minimum heat fluxes. Relationships among qmin/qmax, Weber number, and liquid Jakob number were obtained. Compelling evidence was found to indicate that significant cooling of the wake and/or the forward stagnation line can be caused by large-scale liquid–solid contacts while other parts of the surface experienced film boiling with little or no contact in the transition-film boiling regime. A criterion for large-scale liquid-solid contacts was developed. Another purpose of this study was to investigate whether a stable transition of boiling exists, i.e., if the ratio of the minimum and maximum heat fluxes approaches unity as liquid subcooling and velocity are increased. Extensive data using Freon-113 were taken, covering a wide range of fluid velocities (1.5 to 6.9 m/s) and liquid subcooling (29 to 100°C) at pressures ranging from 122 to 509 kPa. Cylindrical electric resistance heaters of two diameters, 6.35 mm and 4.29 mm, and made of Hastelloy-C and titanium, respectively, were used. The maximum qmin/qmax achievable with the apparatus was 0.9.

Copyright © 1996 by The American Society of Mechanical Engineers
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