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자동차용 증발기 판 내의 증발 열전달 및 유동 특성에 관한 실험적 연구
곽경민,주상우,정우열,김택근,김광일,Kwak, Kyung-Min,Joo, Sang-Woo,Jung, Woo-Youl,Kim, Taek-Keun,Kim, Kwang-Il 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
An experimental study was performed to evaluate the in-plate evaporation heat transfer and flow characteristics of a evaporator used in automobile. Two test-cores with different heat transfer area, bead-shape and bead-array were tested, A type and B type. For the heat transfer, Nusselt number for B type test-core reaches a value nearly equal to the one for A type test-core, in the whole range of equivalent Reynolds number. But, for the same mass flow rate of refrigerant, hA for B type test-core becomes higher with the increase of the mass quality of refrigerant than for A type test-core. In a flow visualization experiment, the wake zone of refrigerant circulating at u-turn position of plate is observed.
Tow in 와류발생기에 의한 핀-관 열교환기의 성능실험
곽경민,배철호,Kahoru Torii 대한설비공학회 2003 설비공학 논문집 Vol.15 No.2
To reduce the air side pressure drop in air-cooled heat exchanger, tow-in type winglet vortex generators are applied. A specially designed multiple-channel test core was used in the experiments for the various geometry of winglet vortex generators. The proposed tow-in type vortex generator gives significant separation delay, reduces form drag, and removes the zone of poor heat transfer from near-wake of the tubes. The results show the significant pressure drop reduction for the tow-in win91e1 vortex generators with the similar enhancement of the heat transfer as other vortex generator applications in heat exchanger. In the range of Reynolds number of 350 to 2100 the pressure drop decrease 8∼15% and 34∼55% for the in-line and staggered tube banks, respectively, compared to those without vortex generators.