| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 91 === The main purpose of this study is to investigate the heat transfer of hot spot for 2-D laminar jet impingement coolant. The jet diameter, channel wide, and Reynolds number are two important parameters on the cooling efficiency of jet impingement coolant. In this study, the range of jet diameter is 5,8,and 10 mm, channel wide is 30,50,and 80 mm, and Reynolds number is from 250 to 700. The jet Reynolds number based on a hydraulic diameter of double jet diameter. The impingement wall is smooth and adiabatic, and the hot spot size is 35 mm and constant heat flux 60 W/㎡. The PHOENICS CFD code is for calculating the flow field and temperature field of 2-D laminar jet impingement coolant model.
The model analysis has the following conclusions; there are three the best heat transfer condition of hot spot. (1) Reynolds number is 700. (2) The narrowest channel wide. (3) The smallest jet diameter.
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