利用CFD技术优化CPU集成热管散热器

摘 要:为了满足未来大功率台式电脑CPU的冷却要求,本文将平板热管和常规热管散热器结合提出了集成热管散热器的新概念。并用CFD数值模拟来代替试验研究，并用试验验证了Star-CD软件进行数值模拟的可靠性和可行性，同时还对两种不同的优化结构进行了流动与传热模拟研究，最终选定最优化结构，并进行了试验测试测试结果表明在气流速度为2.75m/s下新结构的集成热管散热器的热阻在0.1～0.2℃／W间，在200W时模拟CPU的表面温度仅为53℃，完全满足了对CPU的冷却要求。

关键词: CPU；热管；散热器；传热；数值模拟

Abstract：A concept of integrated heat sink using heat pipes employing phase change heat transfer of circular heat pipe and flat miniature heat pipe is proposed to cool higher heat dissipation power CPU in the paper. The numerical simulation method with STAR-CD software is used to investigate flowing and heat transfer performance of heat sink. Validity and reliability of numerical simulation was validated by test and two different optimal structures were simulated by STAR-CD software. Finally, heat transfer performance of an improved integrated heat sink is also evaluated. The experimental results show that its thermal resistance is in the range of 0.1～0.2℃／W and the surface temperature is only 53℃ when applying 200W heat dissipation power to CPU, which has attained the demand of cooling CPU well.

Key words: CPU; Heat pipe; Heat exchanger; Heat-transfer performance; Numerical simulation;