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강희찬(H.C. Kang),이종휘(J.H. Lee) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.2
The purpose of the present study is to investigate the flow resistance and the heat transfer characteristics of oval fin-tube heat exchanger. Six kinds of oval fin having the same fin area and different diameter ratio tested numerically. Test data for the heat transfer, pressure drop and fin temperature were shown and discussed. The pressure drop and heat transfer increased for increasing the oval fin diameter ratio(diameter of span-wise direction to diameter of longitudinal diameter) up to 50% and 45% respectively.
강희찬(H.C. Kang),이종휘(J.H. Lee) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
The purpose of the present study is to investigate the flow resistance and the heat transfer characteristics of oval fin-tube heat exchanger. Six kinds of oval fin having the same fin area and the different diameter ratio tested numerically. Test data for the heat transfer, pressure drop and fin temperature were shown and discussed. The pressure drop and heat transfer increased for increasing the oval jin diameter ratio(diameter of span-wise direction to diameter of longitudinal diameter) up to 50% and 45% respectively.
원형휜-원형관 열교환기의 휜효율 이론에 관한 수치적 검증
강희찬(H.C. Kang),임복빈(B.B. Lim),이종휘(J.H. Lee) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.4
The purpose of the present study is to investigate the convective heat transfer characteristics and the validity of fin efficiency of the circular finned-tube heat exchanger by using commercial CFD code. The heat transfer coefficient obtained by using the laminar model was 22% overestimated to the experimental data. The fin surface temperature compared with the experimental data measured by the liquid crystal method. The fin efficiency by the present numerical experiment, defined as normalized and averaged fin surface temperature, was greater than the theoretical fin efficiency and the difference is increased at high value of the factor mr?.
원형휜-원형관 열교환기의 휜효율 이론에 관한 수치적 검증
강희찬(H.C. Kang),임복빈(B.B. Lim),이종휘(J.W. Lee),장병춘(B.C. Chang),안서욱(S.W. Ahn) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
The purpose of the present study is to investigate the convective heat transfer characteristics and the validity of fin efficiency of the circular finned-tube heat exchanger by using commercial CFD code. The heat transfer coefficient obtained by using the laminar model was 22% overestimated to the experimental data. The fin surface temperature compared with the experimental data measured by the liquid crystal method. The fin efficiency by the present numerical experiment, defined as normalized and averaged fin surface temperature, was greater than the theoretical fin efficiency and the difference is increased at high value of the factor m.
마이크로 구조가 있는 친수성/소수성 표면에서의 젖음성 및 액적 증발 현상에 대한 연구
유동인(D. I. Yu),곽호재(H. J. Kwak),도승우(S. W. Doh),강희찬(H. C. Kang),안호선(H. S. Ahn),박현선(H. S. Park),키요후미 모리야마(K. Moriyama),김무환(M. H. Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
According to the surface condition, the droplet has the contact angle and it is complexly evaporated. Therefore, the evaporation phenomena of the water droplet on the surface should be analyzed on the basis of the wetting phenomena. In this study, it is investigated the wetting and evaporation phenomena of water droplet on the textured hydrophilic / hydrophobic surfaces. On the well-defined surfaces about the surface condition, the apparent contact angle is precisely measured. To compare between experimental data and the previous wetting models, the models are experimentally validated. Subsequently, to study the evaporation phenomena, the contact angle and diameter are measured during droplet evaporation. On the basis of the wetting phenomena, the evaporation performance is analyzed depending on the surface conditions.