Generalized heat-transfer and fluid-flow correlations for corrugated louvered fins

Abstract

We report heat-transfer and fluid-flow correlations to describe the performance of heat exchangers that use corrugated louvered fins. Friction factor f and Colbum factor j were investigated with respect to the ratio of the fin pitch to the louver pitch (F-p/L-p). Whereas previous correlations cannot be applied for F-p/L-p ˃ 1, our fand j correlations can be utilized in a wide range of F-p/L-p which is not only to F-p/L-p ˂ 1, but also to F-p/L-p ˃ 1, for 100 ˂ Re ˂ 3000. We also derived flow efficiency eta correlation which is applicable for 0.3 ˂ L-p sinL(alpha)/F-p ˂ 0.7, where L-alpha, is the louver angle, in 100 ˂ Re ˂ 3000 within an error of +/- 15%. (C) 2014 Elsevier Ltd. All rights reserved.