Heat transfer of impinging air and liquid nitrogen mist jet onto superheated flat surface

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題名:	Heat transfer of impinging air and liquid nitrogen mist jet onto superheated flat surface
作者:	Su, Lo May 蘇樂梅 CHANG, S. W. Yeh, C. I. Hsu, Y. C. (東方技術學院電機工程系)
貢獻者:	東方技術學院電機工程系
關鍵詞:	Impinging air–liquid nitrogen mist jet heat transfer
日期:	2003-12
上傳時間:	2009-12-11 11:33:02 (UTC+8)
摘要:	This experimental study performs the detailed heat transfer measurements of an impinging air–liquid nitrogen mist jet onto a superheated flat surface at atmospheric pressure with reference to the design of an instant freezing facility. A selection of experimental results illustrates the interacting effects of jet Reynolds number, mass flow ratio of air to liquid nitrogen flows and separation distance on the spatial distributions of heat transfer over the impinging surface. Mechanism associated with phase change of impacting droplets generates an enhanced and uniformly distributed heat transfer region centered on the stagnation point. A narrow oval-ring region encapsulating the enhanced core transits heat transfer from the wetting regime of complete evaporation to the non-wetting rebound regime. Stagnation heat transfer augmentation factor in the range of 1.2–2.8 times of the air-jet level is achieved. An empirical correlation based on the experimental data, which is physically consistent, has been developed to permit the evaluation of stagnation heat transfer.
關聯:	International Journal of Heat and Mass Transfer, Volume 46, Issue 25, December 2003, Pages 4845-4862
顯示於類別:	[電機工程系(數位科技系、玩具科)] 期刊論文

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