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원형 제트 충돌 열전달과 유동 특성에 관한 실험적 연구 : 노즐 벽 두께와 노즐 출구 압력의 영향
윤상헌,양근영,손동기,최만수,Yoon, Sangheon,Yang, Geunyoung,Sohn, Dong Kee,Choi, Mansoo 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10
An experimental study on heat transfer and flow characteristics of a circular impinging jet on a flat plate has been carried out. Of particular interests are the effects of nozzle wall thickness and nozzle exit pressure. Experimental apparatus has been designed to view heating plate coated by TLC from the opposite side of the nozzle in order to measure heat transfer rates for cases of very small nozzle to plate spacings. A visualization study of jet flows has also been performed. As the nozzle wall thickness increases at small nozzle to plate spacings, the effect of mixing is inhibited due to the confinement caused by the finite nozzle wall, consequently, heat transfer rates have been decreased. At small nozzle to plate spacings, heat transfer rates and nozzle exit pressures are increased together, therefore, enhancement of heat transfer at small nozzle to plate spacings should be considered in conjunction with the need of more fan power to generate the same Reynolds numbers.
사방 토출식 천장형 실내기의 냉기 토출 각도가 실내 온열 쾌적감에 미치는 영향
박성관(Sung Kwan Park),지선구(Seon Koo Chee),양근영(Geunyoung Yang),오상경(Sang Kyoung Oh) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
It is necessary to develop the air control technique of air conditioning to make a comfort space in the occupancy zone through the detail analysis of temperature and flow inside room. This study concentrates on analysis of indoor thermal environment by controlling air guide system of indoor-unit installed in the ceiling of room. This paper studies how to increase the indoor comfort zone through the air control, and shows the guideline to design the efficient air guide duct of ceiling type. The indoor thermal and flow field are investigated both experimentally and numerically. Test apparatus simulating an air-conditioned room with the ceiling type indoor unit is made to measure the temperature and velocity profile. Commercial CFD code is used to understand the flow distribution and the optimal condition for discharge angle of cooling air. Computational results are analyzed and compared with the experimental result, and used for estimation of indoor thermal comfort index, e.g., PMV. The optimum discharge angle is about 40˚ for an air cooling in this study.