Forced convective heat transfer by swirling impinging jets issuing from nozzles equipped with twisted tapes

被引：56
作者：
Nanan, K. [1 ]
Wongcharee, K. [2 ]
Nuntadusit, C. [3 ]
Eiamsa-ard, S. [1 ]
机构：
[1] Mahanakorn Univ Technol, Fac Engn, Dept Mech Engn, Bangkok 10530, Thailand
[2] Mahanakorn Univ Technol, Fac Engn, Dept Chem Engn, Bangkok 10530, Thailand
[3] Prince Songkla Univ, Fac Engn, Dept Mech Engn, Hat Yai 90112, Songkhla, Thailand
来源：
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2012年 / 39卷 / 06期
关键词：
Impinging jet; Round jet; Heat transfer; Swirling jet; TRANSFER ENHANCEMENT; THERMAL PERFORMANCE; TUBE; FLOW; FIELD;
D O I：
10.1016/j.icheatmasstransfer.2012.05.002
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Forced convective heat transfer on the impinged plate associated with swirling impinging jets (SIJ) issuing from nozzles inserted by twisted tapes has been investigated. Swirling impingement jets with several swirl rates were generated by twisted tapes at different twist ratios (y/W = 3, 4, 5, and 6). The experiments were performed by locating nozzle at 4 different jet-to-plate spacings of L/D = 2, 4, 6 and 8. A jet Reynolds number varied between 4000 and 16000. Attributing to a high momentum transfer rate, an efficient heat transfer was obtained by using the jet with a small jet-to-plate spacing and the twist tape with a large twist ratio at high Reynolds number. At small jet-to-plate spacings (L/D = 2 and 4), swirling impinging jets gave higher heat transfer rate than conventional impinging jets while at large jet-to-plate spacings (L/D = 6 and 8), the opposed result was obtained. Over the range examined, only SIJ induced by the twisted tape at a twist ratio of 6 consistently provided higher average Nusselt numbers than CIJ. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：844 / 852
页数：9
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