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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한설비공학회 International Journal of Air-Conditioning and Refrigeration Journal Of Air-Conditioning and Refrigeration Vol.5
발행연도
1997.8
수록면
32 - 44 (13page)

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Experiment was performed to study the heat transfer characteristicsl in 27 kinds of 15:1 scale models of multi-louvered fin heat exchangers with a wide range of variations(Re_(Lp)=100~1800, Lp/Fp=0.3~0.9, θ=20°~40°). Thermofoil heaters were used to heat louvered fins and the local average Nusselt number for each louver in the array was obtained at constant wall temperature conditions. A correlation was developed to predict the heat transfer characteristics. Generally, the heat transfer characteristics in the multi-louvered fins are shown to be similar to those of laminar heat transfer on a flat plate. As the Reynolds number, the louver pitch to fin pitch ratio(Lp/Fp) and louver angel(θ) increase respectively, the average Nusselt number increases, but the variation of average Nusselt number as a function of the louver angle is smaller than as a function of the louver pitch to fin pitch ratio. In case of Lp/Fp<0.5, the average Nusselt number of the 3rd louver is especially lower than the others. Presumably, this is due to the flow structure such as recirculation flow and flow separation.

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Abstract

1. Introduction

2. Experiment

3. Experimental Results and Discussion

4. Conclusions

References

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