Abstract: Compared with parallel flow cooling, the report of impinging jet cooling has rarely be seen. To study the heat dissipation performance of impinging jet cooling, two radiator were designed in this study. Test bench was built. The cooling medium was deionized water. The temperature variations of CPU chip and radiator bottom plate in different condition were measured by changing the heat flux and cooling water flow. The temperature change of CPU chip and radiator bottom plate was analyzed. By monitoring the inner fin structure anf flow direction of cooling water, the average temperature of CPU could drop 5 to 8℃ and 4℃ for the radiator bottom plate. In addition, the variation range of heat resistance was diminished gradually with the increase of cooling flow. Heat resistance of radiator reduced by 7%-8% due to improvement of radiator structure. The results showed that improvement of radiator structure effectively strengths the disturbance of the corner area and increases heat transfer efficiency of radiator. The present study indicates that impinging jet cooling is a high efficiency radiating way.

Key words: heat transfer, mass transfer, convection, pin fin, water-cooled heat sink

摘要： 与平行流水冷散热相比,现阶段对喷射流水冷散热的研究报道较少。为了研究喷射流结构的散热效果,本文设计了两种喷射流结构的水冷散热器,搭建了以去离子水为冷却介质的液冷散热器实验台,调节实验的热流密度及冷却水流量在不同条件下观察芯片温度及散热器底板温度的变化,得到了不同热流密度下芯片温度、散热器底板温度及热阻随冷却水流量的变化规律。散热器内部针翅结构和冷却水流动方式的改变可使芯片温度降低5~8℃,散热器底板平均温度也相应降低4℃左右,且底板温度梯度较小。同时,热阻的变化随流量增大逐渐变缓,散热器结构改进使热阻减小了7%~8%。实验结果表明,改进结构的散热器能有效加强边角区域流体的扰动,提升散热器整体的换热效率,表明喷射流水冷散热是一种高效的散热方式。

关键词: 传热, 传质, 对流, 针柱, 水冷散热器