標題: Effect of fin pitches on the air-side performance of crimped spiral fin-and-tube heat exchangers with a multipass parallel and counter cross-flow configuration
作者: Pongsoi, Parinya
Pikulkajorn, Santi
Wang, Chi-Chuan
Wongwises, Somchai
機械工程學系
Department of Mechanical Engineering
關鍵字: Fin;Heat transfer;Heat exchanger;Air-water;Extended surface
公開日期: 1-Apr-2011
摘要: This study investigates the effect of fin pitches and fin materials on the air-side performance of crimped fin-and-tube heat exchangers in the range of high Reynolds numbers (4000-13000). The test samples are made from copper and aluminium with different fin pitches (f(p) = 3.2, 4.2 and 6.2 mm). It is found that the proposed simple average effectiveness equation from the pure counter and parallel circuitry arrangement can well represent the effectiveness-NTU relationship for the current z-shape arrangement. The experimental results reveal that the fin pitch casts insignificant effect on the heat transfer characteristics (Colburn j factor). However, a detectable rise of the friction factor is seen when the fin pitch is increased to f(p) = 6.2 mm. On the other hand, the effect of fin material on the airside performance is negligible. (C) 2010 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2010.12.027
http://hdl.handle.net/11536/9069
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2010.12.027
期刊: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume: 54
Issue: 9-10
起始頁: 2234
結束頁: 2240
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