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반원 Pin 핀에서 비절연 끝면과 절연 끝면 경우의 열손실 비교
강형석(Hyungsuk Kang) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
A half circular pin fin with variable fin length, radius and convection characteristic number is analyzed by using the one-dimensional analytic method. The relative error of heat loss between non-insulated fin tip and insulated fin tip is presented as a function of fin length, radius and convection characteristic number. The fin length for the relative error being less than 5% and 1% is listed when certain values of radius and convection characteristic numbers are given. One of the results shows that the relative error increases almost linearly as the pin fin radius increases.
강형석(Hyungsuk Kang) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.5
A reversed trapezoidal fin with variable lateral surface slope is optimized using a two-dimensional analytic method. For a fin base boundary condition, convection from the inside fluid to the inside wall and conduction from the inside wall to the fin base are considered. Heat loss from the fin tip surface is not ignored. The maximum heat loss at the practical fin length, the corresponding optimum fin efficiency, fin length and fin base height are presented as a function of the fin inside and outside convection characteristic numbers. One of the results shows that the optimum fin shape becomes fatter and shorter as the ratio of fin tip height to base height increases.
Pin 핀에서 네가지 다른 단면적 형태가 열손실에 미치는 영향
강형석(Hyungsuk Kang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.춘계 No.-
Pin fins with four different cross sectional area types are analyzed by using the one-dimensional analytic method. Four different cross sectional areas are circular, half circular, rectangular and triangular areas. The temperature distributions along the fin length for pin fins with four different cross sectional areas are presented. Heat loss as functions of the fin length and radius (or line) of cross sectional area is presented. The effect of area ratio on heat loss ratio with variations of convection characteristic number and fin length is listed. One of the results shows that heat loss ratio is larger than area ration when they are compared between a circular pin fin and a half circular (or triangular) pin fin based on the value of a circular pin fin.
강형석(Hyungsuk Kang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A convective rectangular annular fin with variable fin base thickness and height is analysed by using the one dimensional analytic method. Heat loss and thermal resistance are presentee! as a function of the fin base thickness, inside fluid convection characteristic number, fin height and fin length. The relationship between the fin base thickness and fin length for equal amount of heat loss and thermal resistance is depicted. One of the results shows that the effect of fin height and fin length on the thermal resistance is remarkable whereas the thermal resistance is independent of the variation of inside fluid convection characteristic number.