Heat transfer correlations for air-water two-phase flow of different flow patterns in a horizontal pipe |
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Authors: | Dongwoo Kim |
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Affiliation: | 1. School of Mechanical and Aerospace Engineering, Oklahoma State University, 74078, USA
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Abstract: | Heat transfer coefficients were measured and new correlations were developed for two-phase heat transfer in a horizontal pipe
for different flow patterns. Flow patterns were observed in a transparent circular pipe (2.54 cm I. D. and L/D=96) using an
air/water mixture. Visual identification of the flow patterns was supplemented with photographic data, and the results were
plotted on the How regime map proposed by Taitel and Dukler and agreed quite well with each other. A two-phase heat transfer
experimental setup was built for this study and a total of 150 two-phase heat transfer data with different flow patterns were
obtained under a uniform wail heat 11 ux boundary condition. For these data, the superficial Reynolds number ranged from 640
to 35,500 for the liquid and from 540 to 21,200 for the gas. Our previously developed robust two-phase heat transfer correlation
for a vertical pipe with modified constants predicted the horizontal pipe air-water heat transfer experimental data with good
accuracy. Overall the proposed correlations predicted the data with a mean deviation of 1.0% and an rms deviation of 12%. |
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