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김내현(Nae-Hyun Kim),함정호(Jung-Ho Ham),오왕규(Wang-Ku Oh),최용화(Yong-Hwa Choi),하야세(Hayase Gaku) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this study, pressure drop and heat transfer characteristics of plain finned heat exchangers having 5.0 diameter (fin collar 5.3 ㎜) tubes were investigated. Six samples having different fin pitches and tube rows were tested. The fin pitch had a negligible effect on j and f factors. Both j and f factors decreased as the number of tube row increased, although the difference was not significant for the f factor. When compared with the previous 7.3 ㎜ diameter data, both the present j and f factors yielded lower values. However, the j/f ratio was larger at low Reynolds numbers. Possible reasoning is provided from the flow pattern consideration. Comparison with existing correlations were made.