RESEARCH PAPERS: Boiling and Two-Phase Heat Transfer

Heat Transfer of Air/Water Two-Phase Flow in Helicoidal Pipes

[+] Author and Article Information
R. C. Xin, A. Awwad, Z. F. Dong, M. A. Ebadian

Hemispheric Center for Environmental Technology, Florida International University, Miami, FL 33199

J. Heat Transfer 118(2), 442-448 (May 01, 1996) (7 pages) doi:10.1115/1.2825864 History: Received June 01, 1995; Revised February 01, 1996; Online December 05, 2007


Heat transfer of air/water two-phase flow in helicoidal pipes is experimentally investigated in this study. Three test sections were tested in axially horizontal, vertical, and inclined orientations. It has been found that the ratio of the average heat transfer coefficient to that of the water flow is affected by the water flow rate along with the Lockhart–Martinelli parameter. For a fixed water flow rate, there is a maximum heat transfer coefficient as the air fow rate increases. The results indicate that tube diameter has a significant effect on the average heat transfer coefficient ratio. For large-tube-diameter coils, average heat transfer results vary for different orientations. For small-tube-diameter coils, orientation has an insignificant effect on the average heat transfer coefficient. Based on the experimental data, a set of correlations is proposed for the average heat transfer coefficient ratio versus the liquid superficial Reynolds number and Lockhart–Martinelli parameter.

Copyright © 1996 by The American Society of Mechanical Engineers
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