• 대한기계학회논문집
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• 제13권4호
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• pp.753-763
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• 1989

본 연구에서는 대류열전달계수값들이 모두 서로 다르게 주어지는 직선핀 에서의 3차원 과도열전도문제를 변수분리법과 Laplace 변환법을 사용하여 해석함 으로써 핀내부에서의 과도온도분포 및 핀베이스를 통한 과도열유동량에 대한 정확 해를 구하고 직선핀의 과도응답특성에 미치는 관련 매개변수들의 효과와 정상 상태 조건하에서 각종 기하학적 및 열적 매개변수들이 핀성능에 미치는 영향을 조사하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1265-1268
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• 2009

In this paper, the effect of a flow barrier and bypass on the cooling performance for a straight fin heat sink is presented. Both side directions and upward direction of bypass are controlled using various ducts which have different width and heights. In addition, a flow barrier is used to control flow toward heat sink. Through experiments, the distance from leading edge of a heat sink to a flow barrier is varied for various bypasses under fixed volume flow rate condition. This study shows possibility to improve cooling performance when bypass and a flow barrier exist.

• 대한설비공학회지:설비저널
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• 제11권3호
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• pp.1-8
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• 1982

When exact analytical solutions to certain type of heat conduction problems are quite cumbersome or not obtainable, it is important to introduce approximate analytical methods which are simple and useful compared with numerical methods. In this study, therefore, the Heat Balance Integral Method is applied to analysis of steady-state conduction in a straight fin of trapezoidal profile, and the two-dimensional temperature distribution in the fin and the approximate fin efficiency are obtained. Results are compared with those by the one- dimensional analysis and two-dimensional numerical analysis for a wide range of Biot numbers. It is shown that the two-dimensional temperature distribution obtained by the integral method is in good agreement with that by the finite element method at Biot numbers for which the result by the one-dimensional analysis is unreliable.

• 대한설비공학회지:설비저널
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• 제6권2호
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• pp.87-90
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• 1977

핀(fin) 재료의 열전도계수는 온도에 따라 직선적으로 변한다고 가정하여 일차적, 정상상태의 해석을 하였다. 정밀해는 타원적분의 함수로 표시된다. 핀(fin) 효율은 핀끝의 온도의 함수로 주어졌다. 계산을 용이하게 하기 위하여 perturbation해도 구하였다.

• 설비공학논문집
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• 제18권2호
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• pp.95-102
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• 2006

This study analyzes and optimizes a design for a trapezoidal profile straight fin using one-dimensional analytical method. The heat transfer, fin length and fin height are optimized as a function of fin volume, fin shape factor and fin base length. In this optimization, convection characteristic number over fin surface and that of fluid inside fin wall are considered. One of the results shows that the maximum heat loss increases as fin volume increases and both fin shape factor and fin base length decrease.

• International Journal of Air-Conditioning and Refrigeration
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• 제13권3호
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• pp.145-151
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• 2005

A thermally asymmetric straight rectangular fin is analysed and optimized using the two-dimensional separation of variables method. The optimum heat loss is presented as a function of bottom to top Biot number ratio, fin base length and top Biot number. Decreasing rate of the optimum fin length with the increase of the fin base length is listed. The optimum fin tip length is shown as a function of bottom to top Biot number ratio, fin base length and tip to top Biot number ratio. One of the results shows that the optimum heat loss and the actual optimum fin length decrease while the optimum fin tip length increases as the fin base length increases.

• 대한기계학회논문집
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• 제2권1호
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• pp.1-9
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• 1978

냉각용 Fin의 설계문제를 일반적인 최적설계문제로 바꾸어서 일반화된 Steepest Descent 방법에 의한 수치적 방법을 도입하여 해결하였다. 보다 실제적인 문제를 다룰 수 있도록 여러가지 제한조건을 고려한 Fin의 최적곡선 모양의 해를 얻었으며 이 방법의 유용성을 보였다. 사다리꼴의 Fin 설계예에서 위 방법을 이용한 해와 직접 계산에 의한 열전달량의 등고선 그림으로부터 구한 해와 일치함을 보였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.1189-1194
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• 2004

In this paper, the effect of tip clearance on the cooling performance of the microchannel heat sink is presented under the fixed pumping power condition. For the various types of microchannel heat sink having different size of fin width and channel width, experimental study is conducted. Through the experiment, the tip clearance effect is investigated by increasing tip clearance from zero. As a result, it is shown that cooling performance of heat sink with tip clearance is better than that of heat sink without tip clearance. For the microchannel heat sink with tip clearance, the optimum conditions for cooling performance is also studied.

• 대한설비공학회지:설비저널
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• 제8권3호
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• pp.151-157
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• 1979

열전도계수와 열전달계수가 모두 온도에 따라 면하는 균일 단면의 직선휜에서의 온도분포와 열전달에 관한 일반해를 구하였다. 휜재질의 열전도제수와 펄과 주위 유체 사이의 열 전달계수는 온도에 관한 임의의 함수일 수 있다. 직사각형 단면의 천에서 해소중량 조건을 해석하였다. 몇 가지 특별한 경우에 대한 수치 결과는 그라프형태로 주어졌다.

• Advances in Computational Design
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• 제6권1호
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• pp.31-42
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• 2021

This research aims to demonstrate the optimal geometrical design of splayed multiple cross-sectional pin fin heat sinks (SMCSPFHS), which are a type of side-inlet-side-outlet heat sink (SISOHS). The optimiser strength Pareto evolutionary algorithm2 (SPEA2)is employed to explore a set of Pareto optimalsolutions. Objective functions are the fan pumping power and junction temperature. Function evaluations can be accomplished using computational fluid dynamics(CFD) analysis. Design variablesinclude pin cross-sectional areas, the number of fins, fin pitch, thickness of heatsink base, inlet air speed, fin heights, and fin orientations with respect to the base. Design constraints are defined in such a way as to make a heat sink usable and easy to manufacture. The optimum results obtained from SPEA2 are compared with the straight pin fin design results obtained from hybrid population-based incremental learning and differential evolution (PBIL-DE), SPEA2, and an unrestricted population size evolutionary multiobjective optimisation algorithm (UPSEMOA). The results indicate that the splayed pin-fin design using SPEA2 issuperiorto those reported in the literature.