RESEARCH PAPERS: Heat Exchangers

Heat Transfer Correlations for Liquid Film in the Evaporator of Enclosed, Gravity-Assisted Thermosyphons

[+] Author and Article Information
M. S. El-Genk, H. H. Saber

Institute for Space and Nuclear Power Studies, Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, NM 87131-1341

J. Heat Transfer 120(2), 477-484 (May 01, 1998) (8 pages) doi:10.1115/1.2824273 History: Received May 19, 1997; Revised January 05, 1998; Online December 05, 2007


Heat transfer correlations were developed for the liquid film region, in the evaporator section of closed, two-phase, gravity-assisted thermosyphons in the following regimes: (a) laminar convection, at low heat fluxes, (b) combined convection, at intermediate heat fluxes, and (c) nucleate boiling, at high heat fluxes. These correlations were based on a data set consisting of a total of 305 points for ethanol, acetone, R-11, and R-113 working fluids, wall heat fluxes of 0.99–52.62 kW/m2 , working fluid filling ratios of 0.01–0.62, inner diameters of 6–37 mm, evaporator section lengths of 50–609.6 mm, and vapor temperatures of 261–352 K. The combined convention data were correlated by superimposing the correlations of laminar convention and nucleate boiling using a power law approach, to ensure smooth transition among the three heat transfer regimes. The three heat transfer correlations developed in this work are within ±15 percent of experimental data.

Copyright © 1998 by The American Society of Mechanical Engineers
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