Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Year 2006

A. Ghajar
School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, USA

J. Kim
School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, USA

C. Tang
School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, USA

Local heat transfer coefficients and flow parameters were measured for air-water flow in a pipe in the horizontal position and all the flow patterns in the entire flow map. The test section was a 27.9 mm stainless steel pipe with a length to diameter ratio of 100. A total of 179 heat transfer data points were taken on horizontal position by carefully coordinating the liquid and gas superficial Reynolds number combinations. The heat transfer data were measured under a uniform wall heat flux boundary condition ranging from about 3000 W/m² to 10,800 W/m². The superficial Reynolds numbers ranged from about 740 to 26,000 for water and from about 700 to 48,000 for air. These experimental data including all the flow patterns in the entire flow map were reasonably well correlated by a general two-phase heat transfer correlation with 75% of the data predicted within ±20% deviation, and 86% of them were within ±30% deviation. The validation with the experimental data confirmed the robustness of the general two-phase heat transfer correlation to adequately predict the experimental data for most of the flow patterns and wide ranges of the superficial liquid and gas Reynolds numbers (700 < Re_SL < 26,000 and 700 < Re_SG < 48,000).

MPH-14 pages DOI: 10.1615/IHTC13.p12.140 Download article

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