Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)
- Volume 9 Issue 3
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- Pages.259-267
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- 1997
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- 1229-6422(pISSN)
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- 2465-7611(eISSN)
Heat transfer and friction loss characteristics of shaped short pin-fin arrays
짧은 못형핀의 형상 변화에 따른 열전달 및 마찰손실 특성
Abstract
Average heat transfer coefficients and friction coefficients have been measured from staggered short pin-fin arrays to investigate the effect of fin shapes. Flow entering into the test section is a fully developed duct flow and the Reynolds number ranges from 5,000 to 25,000 based on fin diameter and average approaching velocity. The fin has three different shapes; uniform-diameter circular fin, two stepped-diameter circular fins. Average heat transfer rates change slightly with the fin shapes. However, friction loss(pressure loss) for the stepped-diameter fins is significantly less than that for the uniform-diameter fin. This results indicate that the stepped-diameter fin arrays in duct flow enhance heat transfer rates largely based on unit pumping power.
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