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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v1.i2.90
pages 197-209

Condensation of CFC-11 and HCFC-123 in In-Line Bundles of Horizontal Finned Tubes: Effect of Fin Geometry

Hiroshi Honda
Institute of Advanced Material Study, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Hiroshi Takamatsu
Department of Mechanical Engineering, Kyushu University, Fukuoka 819-0395, Japan
Kyoohee Kim
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816, Japan

ABSTRACT

Theoretical and experimental studies were performed to investigate the effect of the fin geometry on the condensation of CFC-11 and HCFC-123 on a horizontal finned tube. Extensive numerical calculations of laminar film condensation with systematically changed values of fin parameters were made for three classes of two-dimensional fins. The highest heat transfer performance was provided with a newly proposed fin shape with a monotonically increasing radius of curvature near the fin tip and a constant thickness near the fin root. Numerical methods were used to develop approximate expressions of the heat transfer coefficient for the newly proposed fin. Experiments were conducted to obtain row-by-row heat transfer data during condensation of downward flowing CFC-11 and HCFC-123 vapors in in-line bundles of horizontal two-dimensional fin tubes. Two conventional low-fin tubes and two finned tubes with fin shapes close to the newly proposed profiles were tested. The highest heat transfer performance, about 85% higher than the conventional 26-fpi tube, was obtained by one of the new tubes. Predictions of the previously developed theoretical model compared well with experimental data for both the conventional and newly proposed finned tubes at a low vapor velocity and a low to medium condensate inundation rate.


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