Critical Heat Flux in Helically Coiled Tubes

Author:

Jensen M. K.1,Bergles A. E.2

Affiliation:

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

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

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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