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http://dx.doi.org/10.3795/KSME-B.2002.26.12.1681

Air-side Performance of Louver-Finned Flat Aluminum Heat Exchangers at a Low Velocity Region  

Cho, Jin-Pyo (인천대학교 대학원)
Oh, Wang-Kyu (인천대학교 대학원)
Kim, Nae-Hyun (인천대학교 기계공학과)
Youn, Baek ((주)삼성전자)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.26, no.12, 2002 , pp. 1681-1691 More about this Journal
Abstract
The heat transfer and pressure drop characteristics of heat exchangers with louver fins were experimentally investigated. The samples had small fin pitches (1.0 mm to 1.4 mm), and experiments were conducted up to a very low frontal air velocity (as low as 0.3 m/s). At a certain Reynolds number (critical Reynolds number), the flattening of the heat transfer coefficient curve was observed. The critical Reynolds number was insensitive to the louver angle, and decreased as the louver pitch to fin pitch ratio (L$_{p}$F$_{p}$) decreased. Existing correlations on the critical Reynolds number did not adequately predict the data. It is suggested that, for proper assessment of the heat transfer behavior, the louver pattern in addition to the flow characterization need to be considered. The heat transfer coefficient increased as the fin pitch decreased. At low Reynolds numbers, however, the trend was reversed. Possible explanation is provided considering the louver pattern between neighboring fins. Different from the heat transfer coefficient, the friction factor did not show the flattening characteristic. The reason may be attributed to the form drag by louvers, which offsets the decreased skin friction at a low Reynolds number. The friction factor increased as the fin pitch decreased and the louver angle increased. A new correlation predicted 92% of the heat transfer coefficient and 90% of the friction factor within $\pm$10%.10%.
Keywords
Lorver Fin; Brazed Aluminum Heat Exchanger; Flat Tube; Heat Transfer Coefficient; Pressure Drop;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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