Gas-Concentration Measurements and Analysis for Gas-Loaded Thermosyphons

[+] Author and Article Information
P. F. Peterson, C. L. Tien

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Heat Transfer 110(3), 743-747 (Aug 01, 1988) (5 pages) doi:10.1115/1.3250554 History: Received July 27, 1987; Online October 20, 2009


Using a miniature wet-bulb/dry-bulb probe, detailed measurements of noncondensable-gas-concentration profiles were made in a gas-loaded two-phase reflux thermosyphon to investigate the effects of orientation and gas/vapor molecular weight combinations. Natural convection and radial diffusion were found to have a large influence on the noncondensable-gas distribution, even when the gas and vapor molecular weights are equal. An axisymmetric two-dimensional diffusion model is presented to allow evaluation of the relative effects of natural convection versus diffusion. Gas recirculation, axial stratification, regions of unstable flow, and their effects on performance are discussed.

Copyright © 1988 by ASME
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