非等直径柱肋阵列的冷却特性

为优化柱肋阵列冷却效果,通过缩小柱肋阵列中局部柱肋直径得到3种非等直径柱肋阵列通道。采用瞬态液晶测试技术和数值模拟方法研究了其传热和流阻特性。结果表明:保持奇数排柱肋直径的大小,仅减小偶数排的直径,能在传热减弱不多的情况下,使通道的流动阻力大幅降低。适当调整奇/偶数排柱肋的直径,雷诺数为10 000~50 000,奇偶数排柱肋直径比为1.4的非等直径柱肋阵列通道,其平均传热系数仅减小了约6%,而阻力系数则减小了约21%。 

Cooling characteristics of pin-fin arrays with non-uniform diameters

Three pin-fin array with non-uniform diameters were considered for the purpose of cooling　characteristics optimization.　Combined method of transient liquid crystal technique test　and numerical simulation was employed to investigate　their heat transfer and pressure drop characteristics. The results showed that low pressure drop can be achieved when downsizing several rows of pin-fin diameters with a small cost of heat transfer loss. Within the Reynolds number from 10 000 to 50 000, the pin-fin array with 1.4-folds diameters ratio between odd and even rows caused just 6% decrease on average heat transfer factor, however, its friction factor declined as large as 21%.