Evaluation of Heat Transfer and Pressure Loss Performances of Louvered Fins by Modified Single-blow Method

Abstract

The modified single-blow transient testing technique was applied to evaluate heat transfer and pressure loss performances of actual louvered fin heat exchanger cores. A systematic measurement was conducted for the louvered fin surfaces varying transverse fin pitch in order to investigate the effect of the channel cross section shape as well as the Reynolds number, Re. In this study, the ratio of louver pitch and hydraulic diameter, l/d_h, was used as a parameter to represent the channel cross section shape. Empirical equations were obtained for heat transfer and pressure loss performances in terms of Gz, Pr and l/d_h.