제트충돌냉각되는 반원 오목면에서 열전달 및 유체유동에 관한 실험적 연구 = An Experimental Study on Heat Transfer and Fluid Flow on the Semi-Circular Concave Surface Cooled by Jet Impingement

다국어 초록 (Multilingual 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.