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쉴리렌 간섭계에 의한 사각덕트내 후향계단후 유동에서의 혼합대류 전열에 관한 연구
백병준,박복춘,김진택,Baek, B.J.,Pak, B.C.,Kim, J.T. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.1
The flow and heat transfer characteristics behind a backward facing step located in a vertical channel has been studied. In this study, the numerical prediction has been performed by solving the Navier-Stokes equation and energy equation simultaneously with the SIMPLE algorithm embedied in TEACH code. Local heat flux was measured by using Schlieren Interferometer. The flow visualization was performed using the cylindrical lens and the laser beam that is scattered by the supplied glycerine particles. The velocity and temperature distributions, recirculation region, reattachment length, and local heat flux are obtained under the various parameters to investigate the buoyancy effect on the flow and heat transfer characteristics behind the step.
자동차용 에어컨의 고밀도 응축기 (SCC) 에서 배플의 위치 변화에 따른 성능향상에 관한 연구
이명재(M. J. Lee),박복춘(B. C. Pak),백병준(B. J. Back),염동석(D. S. Yeom),한창섭(C. S. Han) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.6
A new super compact condenser(SCC), which has been developed recently is especially suitable for an alternative refrigerant HFC-134a due to its high performance and compactness. The see is composed of two pipe headers, baffles, narrow multi-rectangular channels, and louvered fin arrays. Alternating inlet and outlet by the inserted baffles in pipe headers guide refrigerant to and from the narrow multi-rectangular channels. Since the flow rate and its length are changed depending on the number and location of baffles, the corresponding pressure drop and heat transfer rate are changed. The present study aims to theoretically and experimentally investigate the effects of baf-flr location and its number on the pressure drop and thermal performance of the see with 40 multi -rectangular channels.<br/> The results show that the present method provides an acceptable prediction of pressure drop and heat transfe rate for a 4 pass sec. However, the model significantly underpredicts the performance of a 3 pass see, which may be attributed to the phase separation of refrigerant flowing through header pipes. Pressure drop is more significantly influenced than heat transfer rate by the baffle lo-cation.<br/>