一种复合型散热器传热性能和流动特性的研究

Research on the Heat Transfer and Flow Performance of a Composite Heat Sink

提出一种用于电力电子器件散热的矩形翅片与叉排钉柱结合的复合型散热器,该散热器的结构是在矩形翅片式散热器通道内适当的位置上设置两排钉柱.实验表明:在同样散热量和风速下,复合型散热器的热阻比矩形翅片式散热器低10%～20%;风速为2m/s时复合型散热器的流动阻力比矩形翅片式散热器高10%,比相同散热面积的叉排钉柱散热器的流动阻力要低得多;在相同风速和相同散热器底面温度下,复合型散热器单位面积的散热率与叉排钉柱散热器相当,比矩形翅片式散热器高10%～17%.

A type of composite heat sink is suggested to improve electric and electronic device cooling, in which in each tunnel two rows of circular pins are staggered at proper positions between two plate fins. Its heat transfer and flow performance are investigated experimentally. The experimental results show that under the same conditions of heat dissipation and wind velocity, the thermal resistance of the composite heat sink is 10%-20% lower than that of the current plate-fin heat sink. When the wind velocity is 2 m/s, the flow resistance of the composite heat sink is about 10% higher than that of the plate-fin heat sink, but much lower than that of the staggered pin fin heat sink. While the wind velocity and the temperature of heat sink base remain the same, the heat dissipation per square centimeter of the composite heat sink is almost the same as that of the staggered pin fin heat sink, and 10%-17% higher than that of the plate-fin heat sink.