The heat transfer analysis of impinging jet flow

• Main Authors: Ming-Hong Shiu, 徐銘鴻
• Other Authors: Po-Jen Cheng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/70363545379621485404

碩士 === 遠東科技大學 === 機械研究所 === 97 === Impinging jet cooling has good characteristics, such as low cost, high reliability and using conveniently, therefore, it is widely applied to the electronic cooling. The impinging jet cooling can easy and fast cool the local region and obtain the larger efficiency as the heat sink exists. Hence the design of the fin geometry is crucial for increasing the heat transfer and decreasing the device temperature. In this thesis, the simulated method is used to analyze the design of the heat sinks. The optimization of the shape of the heat sink is investigated in order to reach the optimal heat removal. The thermal resistances are discussed by changing the height and the width of the fin, the Reynolds number of the impinging flow, and the distance between the jet and the heat sink. Our research reveals that the increasing of the impinging jet velocity can increase the heat removal of the heat sinks. However, the enhancement of heat transfer is not apparently observed as the impinging velocity increases. In contrast, we observe many important effects such as the heat removal increases as the increasing of the fin width and height. However, the effects are not conspicuous as those caused by changing width, height and impinging jet velocity. The reason is that the combined effects resulted from the fin widths, the channel widths and the Reynolds number are very complex. According our conclusions, we expect that the operation of the impinging jet cooling can reach the robust and exact state. In addition, we will use the optimal method to process the optimization of the heat sink design in future. It can achieve the largest heat removal under the best control of the parameters.