Enhancement of Condensation on a Vertical Plate (2nd Report, Prediction of Condensation on a Dispersed Finned Surface)

被引:1
|
作者
Chu, Rencai [1 ]
Hatanaka, Tsutomu [1 ]
Nishio, Shigefumi [2 ]
机构
[1] Komatsu Ltd, Res Div, 1200 Manda, Hiratsuka, Kanagawa 2548567, Japan
[2] Univ Tokyo, Inst Ind Sci, Tokyo, Japan
来源
HEAT TRANSFER-ASIAN RESEARCH | 2010年 / 39卷 / 03期
关键词
condensation; heat transfer enhancement; dispersed finned surface;
D O I
10.1002/htj.20288
中图分类号
O414.1 [热力学];
学科分类号
摘要
In this study, a prediction model for condensation heat transfer on a vertical dispersed finned surface was proposed, utilizing the Adamek-Webb model for condensation heat transfer outside a horizontal finned tube. The prediction model was based on two main experimental observation results. One is the phenomena of the condensate retention at the bottom of each row of the dispersed fin. Another is the offset phenomena of the condensate flow between each row of the dispersed fin. Given the results by the present model, it is predicted that the dependence of the condensation heat transfer coefficient for the dispersed finned surface on the fin pitch is controlled mainly by the dispersed fin length, not the total fin length. On the contrary, for a different fin pitch, the effect to the condensation heat transfer by dispersing the fin is different. From comparison with the experiment results, it is confirmed that the present model was able to predict the condensation with extremely good precision when the fin pitch was larger. Further, when the fin pitch was smaller, the predicted values were higher than the experimental values, but the tendency of the condensation heat transfer with dispersing the fin was nearly predicted. In addition, this condensing model can predict the experimental values with an error of 25% at the maximum in a range of fin pitch 0.6 mm to 1 mm. (C) 2010 Wiley Periodicals, Inc.
引用
收藏
页码:178 / 194
页数:17
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