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Flow Efficiency in Multi-Louvered Fins Having Large Louver-to-Fin Pitch Ratio  

Kim, Nae-Hyun (Department of Mechanical Engineering, University of Incheon)
Cho, Jin-Pyo (Department of Mechanical Engineering, University of Incheon)
Kim, Do-Young (Department of Mechanical Engineering, University of Incheon)
Kim, Hyun-Jin (Department of Mechanical Engineering, University of Incheon)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.15, no.4, 2007 , pp. 156-162 More about this Journal
Flow visualization experiments were conducted for two louver arrays having large louver pitch ratio ($L_p/F_p=1.0$ and 1.4). Flow efficiencies and critical Reynolds numbers were obtained from the data, and were compared with existing correlations. The correlations failed to predict the present flow efficiency data adequately; some correlation overpredicted the data, while others underpredicted the data. Large louver pitch ratio of the present model, which is outside of the applicable range of the correlations may partly be responsible. The critical Reynolds numbers obtained from the present flow visualization data were in close agreement with those obtained from the heat transfer tests on actual flat tube heat exchangers. Existing correlations on the critical Reynolds number generally overpredicted the present data.
Flow visualization; Flow efficiency; Brazed aluminum heat exchanger; Flat tube; Louver fin;
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