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RESEARCH PAPERS: Boiling and Condensation

Transition Boiling Curves in Saturated Pool Boiling From Horizontal Cylinders

[+] Author and Article Information
E. K. Ungar

Crew and Thermal Systems Division, NASA, Johnson Space Center, Houston, TX 77058

R. Eichhorn

Cullen College of Engineering, University of Houston, Houston, TX 77204

J. Heat Transfer 118(3), 654-661 (Aug 01, 1996) (8 pages) doi:10.1115/1.2822682 History: Received February 18, 1995; Revised May 17, 1996; Online December 05, 2007

Abstract

Pool boiling heat flux versus wall superheat boiling curves were obtained for horizontal 3.18-mm-dia thin-walled brass tubes heated by an internal high-speed flow of ethylene glycol. The boiling liquids were saturated n-pentane, R-113, acetone, methanol ethanol, benzene, and isopropanol. Boiling results include nucleate and transition boiling in all the test liquids, but film boiling was achieved only with methanol. The measured peak heat fluxes are well correlated by available predictions. The methanol experiments clearly display two transition boiling curves, one obtained on increasing the cylinder temperature from nucleate boiling, the other on decreasing the cylinder temperature from film boiling. For the cases in which the highest cylinder temperature reached only into the transition regime, a single transition boiling curve resulted.

Copyright © 1996 by The American Society of Mechanical Engineers
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