대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제22권4호
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- Pages.530-541
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- 1998
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
사각 덕트내 요철의 각도 변화에 따른 열전달 특성
Augmented heat transfer in a rectangular duct with angled ribs
- U, Seong-Je (Dept.of Mechanical Engineering, Graduate School of Yonsei University) ;
- Kim, Wan-Sik (Dept.of Mechanical Engineering, Graduate School of Yonsei University) ;
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Jo, Hyeong-Hui
(Dept.of Mechanical Engineering, Graduate School of Yonsei University)
- 발행 : 1998.03.01
초록
Heat transfer augmentation in a rib-roughened duct is affected by the rib configurations, such as rib height, angle of attack, shape, rib to rib pitch, and aspect ratio of a duct. These have been the main subjects in studying the average heat transfer and the friction loss of the fully developed flow. Investigating distributions of local heat transfer coefficients and flow patterns in a duct with the rib turbulators is necessary to find the characteristics of heat transfer augmentation and to decide the optimal configurations of ribs. In the present study the numerical analyses and the mass transfer experiments are performed to understand the flow through a rib roughened duct and the heat transfer characteristics with various angles of attack of ribs. A pair of counter-rotating secondary flow in a duct has a main effect on the lateral distributions of local mass transfer coefficients. Downwash of the rotating secondary flow, reattachment of main flow between ribs and the vortices near ribs and wall enhanced the mass transfer locally up to 8 times of that in case of the duct without ribs.
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