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强化传热期刊
影响因子: 1.406 5年影响因子: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN 打印: 1065-5131
ISSN 在线: 1563-5074

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v9.i1.20
pages 25-37

Heat Transfer and Pressure Drop During Evaporation and Condensation of HCFC22 in Horizontal Copper Tubes with Many Inner Fins

Seiichi Ishikawa
Research and Development Center, Mitsubishi Shindoh Co., Ltd., Fukushima, Japan
Kotaro Nagahara
Research and Development Center, Mitsubishi Shindoh Co., Ltd., Fukushima, Japan
Shunroku Sukumoda
Research and Development Center, Mitsubishi Shindoh Co., Ltd., Fukushima, Japan

ABSTRACT

Experimental tests using R22 were conducted to measure the condensation coefficient and the vaporization coefficient inside a given microfin tube (Wolverine DX-75). Data were also taken for nucleate pool boiling on a plain surface and on the microfin surface. A key objective of the present work is to define the contribution made by nucleate boiling to the microfin tube evaporation performance. An asymptotic model is used to combine the nucleate boiling and convective terms to account for both contributions. This was done using the experimental condensation and nucleate boiling curves. The convective contribution for vaporization is the same as for convective condensation below 70% and also below the dryout point. The tests show that nucleate boiling makes a significant contribution to vaporization for vaporization of R22 in a microfin tube.


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