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딤플에 의한 루우버휜 열교환기의 공기측 압력강하, 열전달 및 배수 성능향상
강희찬(Hiechan Kang),오현식(Hyun-sik Oh),임무기(Moogi Lim),공태윤(Taeyun Kong),박성욱(Sungwook Park),정순안(Sunan Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The present study proposed a dimpled louver fin by adding dimpled slots between the end region of louver fin and the brazing line of the flat to reduce flow resistance and enhance drainability. Numerical simulations were conducted for the conjugated heat transfer of 2 kinds of fin geometry by using the commercial CFD code. The drainability was tested for the four enlarged plastic models made by the rapid prototype machine. The dimpled louver fin showed 14% less airflow pressure drop coefficient than the baseline louver fin, the advantage increasing at low air velocity. The dimpled louver fin shows up to 5% higher than the baseline fin in the performance index of the heat transfer capability per unit temperature potential for the same fan power. The dimpled louver fin drained water better and held substantially less than the baseline fin in the deep test.
강희찬(Hiechan Kang),오현식(Hyun-sik Oh),전길웅(Gilwoong Jun),김광일(Kwangil Kim),정순안(Sunan Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The present work was performed to investigate friction and heat transfer inside flat tubes having high aspect ratios for automobile applications. The pressure drop and heat transfer coefficients for laminar, transition and turbulent flow regimes were measured and discussed. The transition flow regime was observed at the Reynolds numbers 900-4,000. The pressure drop coefficients were 15% higher for the laminar flow and 12% higher for the turbulent flow than the theoretical predictions. The present experimental data for the flat tube were higher than those for the circular tube.
강희찬(Hiechan Kang),강민철(Minchul Kang),김광일(Kwangil Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The purpose of the present study was to investigate the characteristics of the pressure drop, heat transfer rate and drainability of a brazed aluminum heat exchanger. Plane, standard and slant louver fins model were made that were enlarged several times over actual size, and their thermal and hydraulic performances were tested in a wind tunnel. The drainability of the fins was compared by the retained water after dipping the heat exchanger. The slant louver fin showed a 13% higher pressure drop and 2% lower heat transfer coefficient than the standard louver fin. The slant fin retained about half of the water of the louver fin.