Critical Heat Flux in Helically Coiled Tubes

[+] Author and Article Information
M. K. Jensen

Department of Mechanical Engineering, The University of Wisconsin-Milwaukee, Milwaukee, Wisc. 53201

A. E. Bergles

Department of Mechanical Engineering and Engineering Research Institute, Iowa State University, Ames, Iowa 50011

J. Heat Transfer 103(4), 660-666 (Nov 01, 1981) (7 pages) doi:10.1115/1.3244523 History: Received June 16, 1980; Online October 20, 2009


A study of boiling R-113 in electrically heated coils of various diameters is reported. Subcooled critical heat flux (CHF) is lower with coils than with straight tubes. The difference increases as mass velocity and ratio of tube diameter to coil diameter (d/D) increases. On the contrary, quality CHF is enhanced and increases with d/D; CHF initially increases with increasing mass velocity, but decreases after a maximum is reached. Operational problems, in particular upstream dryouts, can occur if a coiled tube is operated with low to moderate subcooling near the inlet and with moderately high heat fluxes.

Copyright © 1981 by ASME
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