Critical-Heat-Flux and Flow-Pattern Observations for Low-Pressure Water Flowing in Tubes

[+] Author and Article Information
A. E. Bergles

National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Mass.

R. F. Lopina, M. P. Fiori

Massachusetts Institute of Technology, Cambridge, Mass.

J. Heat Transfer 89(1), 69-74 (Feb 01, 1967) (6 pages) doi:10.1115/1.3614324 History: Received April 04, 1966; Revised July 21, 1966; Online August 25, 2011


This paper summarizes the results of an investigation of the critical-heat-flux condition for bulk boiling of water in uniformly heated round tubes where the inlet conditions were subcooled and exit pressures were below 100 psia. Choked flow was found to be prevalent under these conditions. The critical heat flux is shown to be a complex function of both local and inlet conditions. Detailed flow-pattern observations were made with an electrical probe. Many of the trends in the critical-heat-flux data can be related to the flow-pattern instability caused by slug flow.

Copyright © 1967 by ASME
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