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한면에 리브가 설치된 4면 수축/확대 채널의 난류열전달과 유체마찰
이명성(M. S. Lee),한양희(Y. H. Han),차동규(D. G. Cha),안수환(S. W. Ahn) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
The local heat transfer and pressure drop of developed turbulent flows in the convergent/divergent channels with square cross-sectional areas along the axial distance have been investigated experimentally. The rectangular convergent/divergent channels with one sided ribbed surface are manufactured with a fixed rib height (e) =10 mm and the ratio of rib spacing (p) to height(e) =10. The measurement was conducted within the range of Reynolds numbers from 15,000 to 89,000. The local heat transfer coefficient decreases continuously in the streamwise direction in the ribbed rectangular divergent channels. For the ribbed rectangular convergent channels, the local heat transfer coefficient decreases at the inlet region, and then increases rapidly along the main flow direction.
Heat transfer and friction factor in the ribbed rectangular divergent channel
M. S. Lee(이명성),H. B. Kim(김현범),S. H. Lee(이승호),S. W. Ahn(안수환) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
The heat transfer and friction factors of developed turbulent flows in the stationary ribbed rectangular divergent channels have been investigated experimentally. The rectangular divergent channels with one sided ribbed surface only have the inclination angles of 0.72° and 1.43° at which the ribbed wall is manufactured with a fixed rib height (e) =10 mm and the ratio of rib spacing (p) to height(e) = 10. The measurement was conducted within the range of Reynolds numbers from 15,000 to 89,000. Because of the streamwise flow deceleration, the heat transfer characteristics of the rectangular divergent channels are quit different from those of the square straight channel. Thermal performances of the ribbed rectangular divergent channels are compared with the fibbed square straight channel under three constraints: identical mass flow rate, identical pumping power, and identical pressure drop. The comparison shows that among the two channels (D<SUB>ho</SUB>/D<SUB>hi</SUB> = 1.16 and 1.49) the divergent channel of D<SUB>ho</SUB>/D<SUB>hi</SUB> =1.49 has the higher thermal performance at the identical mass flow rate, and the divergent channel of Dho/Dhi ?1.16 has the higher thermal performance at the identical pumping power and static pressure drop.