Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study on Heat Transfer and Fluid Flow on the Semi-Circular Concave Surface Cooled by Jet Impingement

제트충돌냉각되는 반원 오목면에서 열전달 및 유체유동에 관한 실험적 연구

  • Yu, Han-Seong (Dept.of Mechanical Engineering, Graduate School of Seoul National University) ;
  • Yang, Geun-Yeong (Dept.of Mechanical Engineering, Graduate School of Seoul National University) ;
  • Lee, Jun-Sik (Dept.of Mechanical Engineering, Seoul National University) ;
  • 유한성 (서울대학교 대학원 기계공학과) ;
  • 양근영 (서울대학교 대학원 기계공학과) ;
  • 이준식 (서울대학교 기계공학과) ;
  • Published : 1996.09.01
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Abstract

An experimental study of jet flow and heat transfer has been carried out for the jet impingement cooling on a semi-circular concave surface. For the jet impingement on the concave surface, three different regions-free jet region, stagnation region, and wall jet flow region-exist, and the distributions of mean velocity and fluctuating velocity for each region have been measured by Laser Doppler Velocimeter. Of particular interests are the effects of jet Reynolds number, the distance between the nozzle exit and cooling surface apex, and the distance from the stagnation point in the circumferential direction. The resulting characteristics of heat transfer at the stagnation point and the variation of heat transfer along the circumferential direction including the existence of secondary peak have been explained in conjunction with measured impinge jet flow.

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