计算机CPU散热器强化传热与可靠性分析

Enhancing Transfer for CPU Heat Sink and Reliability Analysis

本文通过对计算机CPU散热器简化模型,首先研究了标准k-ε湍流模型、标准k-ω湍流模型和剪切应力传输(SST)k-ω模型三种湍流模型对实验结果的影响,由进出口压降及湍流耗散率可知,选用标准k-ε湍流模型进行模拟;分段开缝散热器能够强化传热,分别对开缝宽度和开缝数进行了研究,确定了最佳开缝宽度为3.5mm;研究了开缝数为1、2、3时的散热效果,发现开缝多的翅片散热效果较好。然而随着开缝数的增多,翅片的换热面积越来越大,强化传热的有效性下降。

The model of the computer CPU heat sink is simplified in this paper. Firstly, the effect of three types turbulence model on experimental results is researched, which included standard k-ε, standard k-ωand SST k-ω model. According to the inlet and outlet pressure and turbulent dissipation rate, the standard k-ε turbulence model was selected for calculation. The heat sink with segment slot can enhance heat transfer, and the slit width and slit number were studied, respectively. And the value of the optimum slit width determined is 3.5mm;heat transfer performance was studied when the slot number is 1,2 and 3. It was founded that heat transfer performance is better with the more slot number. However, with the increasing of the slit number, the heat transfer area of fins increase, effectiveness decrease for enhancing transfer.