Abstract
Abstract In this study, wet surface heat transfer and friction characteristics of non-symmetric slit-finned heat exchangers are experimentally investigated. Louver-finned heat exchangers are also tested for comparison purpose. Theeffect of fin pitch on j and f factor is negligible. Louver fin samples yield higher j and f factors than slit fin samples. For one row, j and f factors of louver fin are 27% and 31% higher than those of slit fin. For two row, j and f factors of louver fin are 15% and 30% higher. Both j and f factor decrease as the number of tube row increases. For onerow, average j/f ratios of slit fin samples are 3.4% larger than those of louver fin samples. For two row, average j/f ratios of slit fin samples are 11.5% larger. A new correlation was developed using the present data. Key Words : Heat transfer coefficient, Pressure drop, Slit fin, Wet surface * Corresponding Author : Nea-Hyun Kim (Incheon National Univ.) Tel: +82-032-835-8420 email: knh0001@incheon.ac.krReceived February 3, 2015 Accepted June 11, 2015Revised (1st March 20, 2015, 2nd April 1, 2015)Published June 30, 2015
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