Determination of Boiling Film Coefficient for a Heated Horizontal Tube in Water-Saturated Wick Material

[+] Author and Article Information
William D. Allingham, Jack A. McEntire

Boeing Airplane Company, Seattle, Wash.

J. Heat Transfer 83(1), 71-75 (Feb 01, 1961) (5 pages) doi:10.1115/1.3680470 History: Received May 04, 1960


Using an absorbent wick material saturated with a coolant has become attractive from a design standpoint for some missile-cooling applications. However, published data for predicting film coefficients are very limited. In this study, boiling film coefficients for a 1.0-in. OD horizontal copper tube embedded in water-saturated ceramic fiber-wick material were correlated over a heat-flux range from 1000 to 10,000 Btu per hr sq ft by the dimensionless equation

hCG CμK0.6 ρLσP20.21
  = 0.072 DeGμ−0.77
G = QAελ
The presence of wick material next to a heat-transfer surface decreases turbulence in the region near the surface, increases the effective surface area, and provides active sites for bubble formation. This produces a higher film coefficient at low heat flux than occurs with pool boiling. At higher heat flux, the wick-boiling film coefficient was lower than for pool boiling.

Copyright © 1961 by ASME
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