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수직 평판에 설치된 경사 핀-휜의 혼합대류 열전달 특성에 대한 수치적 연구
오영웅(Yeong Woong Oh),최윤석(Yoon Suk Choi),하만영(Man Yeong Ha),민준기(June Kee Min) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The heat transfer of slanted-pin fins mounted on a vertical heated wall under laminar mixed convection condition has been investigated numerically, which is an extended study of the authors previous research on the natural convection [5]. Assuming the air is the ideal gas, three-dimensional governing equations of flow and heat transfer was solved using the periodic boundary condition in the horizontal lateral direction with the SIMPLE algorithm. The radiation heat transfer was calculated by using the discrete ordinate method to make sure the validation through a comparison with the experimental data. The effects of the fin-inclination angle were conducted in a modified Richardson number range of 500 - 2500 by varying the Reynolds number at a fixed Grashof number under constant heat flux conditions. As the forced convection increases, the advantageous fin-inclination angle having the best heat transfer capability became from negative to positive fin angles. The critical Richardson number showing this transition phenomena and corresponding characteristics of flow and heat-transfer are summarized.