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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.
유한요소해석을 이용한 핫스탬핑 공정의 성형성 및 상변태 해석
구광모(K. M. Ku),장병춘(B. C. Chang),임은수(E. S. Lim),오유리(Y. R. Oh),양동욱(D. U. Yang) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
The center pillar that has great effect on safety during side impact for car is required mechanical properties. Therefore, hot stamping process is used to manufacture high strength center pillar. It performs press forming and quenching at the same time. This method increases the productivity and obtains the high strength part. The cold working using high strength steel was difficult to form because of spring back defect, but formability of hot stamping in hot working is excellent. In this study, Finite element analysis was performed to reduce the cost of securing the process condition. It is analyzed as part of formability, temperature distribution by quenching and phase transformation using by AutoForm program and die design is optimized after design of hot stamping press die.