A Visual Study of Two-Phase Flow While Evaporating in Horizontal Tubes

[+] Author and Article Information
W. R. Zahn

Heat Transfer Section, Advance Engineering, York Division, Borg-Warner Corp., York, Pa.

J. Heat Transfer 86(3), 417-429 (Aug 01, 1964) (13 pages) doi:10.1115/1.3688713 History: Received August 28, 1963


A review of the literature shows no data for horizontal two-phase one-component flow with evaporation; therefore, visual studies have been made of the flow patterns of evaporating R-22 (commercially pure dichloro-difluoro-methane) inside horizontal tube sections under pressure, temperature, flow, and heat load conditions simulating actual operation of a small air-conditioning coil. Description of the patterns observed are given along with data to use in checking with volume flow fraction, Froude number flow regime maps and with maps using Baker’s [1] parameters. A discussion on the qualitative relation between coefficients, the type of flow, effect of return bends, and flow instabilities is included.

Copyright © 1964 by ASME
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