平板微热管阵列及其传热特性

摘要

研制了结构紧凑的带有微结构的平板微热管阵列,并对其充装不同工质时的传热性能进行测试.同时对热管内充装不同工质时的热通量进行了测试.结果表明,在使用甲醇、乙醇、丙酮、R141b为工质的情况下该平板微热管阵列的散热效果良好,其中甲醇为工质的散热器在保证芯片表面正常的工作温度下的最大热通量及总热量输运能力分另0达到102 W·cm-2及102 W以上.最高热通量可达200 W·cm-2以甲醇为工质的不同充液率实验表明,平板微热管阵列的热通量随充液率的不同而有所变化,最佳充液率为0.3.%Various flat micro-heat pipe arrays with miniature axially grooves for electric chip cooling are constructed. A series of experiments including start-up time, temperature distribution and heat flux with different working fluids and filling factors are carried out. The result shows that flat micro-heat pipe arrays have advantages of quicker start-up, less temperature difference and better heat transfer. R141b, acetone, methanol and ethanol are used as working fluids. Flat micro-heat pipe arrays filled with methanol have the best heat transfer performance. The maximum heat flux can reach 102 W · Cm-2 while the chip is maintained at its working temperature, below 70°C. The best filling factor of methanol is 0. 3 for high heat flux.