설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)
- 제9권3호
- /
- Pages.259-267
- /
- 1997
- /
- 1229-6422(pISSN)
- /
- 2465-7611(eISSN)
짧은 못형핀의 형상 변화에 따른 열전달 및 마찰손실 특성
Heat transfer and friction loss characteristics of shaped short pin-fin arrays
초록
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.
키워드