微通道散热器新型结构设计及流动与散热分析

New structure design and analysis of flow and heat dissipation performance of microchannel heat sink

为了提高微通道散热器的散热性能,采用Fluent对散热器内部流场流动和换热特性进行了数值仿真分析。同时通过调整通道和翅片截面的宽度,添加肋柱与孔洞,设计了一种新型微通道散热器结构。结果表明:在不同入口体积流量(0.25—1.5 L/min)下,新型微通道散热器结构的各通道内质量流量的极差为初始结构的1/8,流体不均匀分配因子为初始结构的9%—56%,基底最大温度降低6.4—8.8℃,基底平均温度降低7.1—10.1℃,高换热量区内换热量的极差为初始结构的17%—24%,平均Nu数是初始结构的2.1—2.4倍。Rth值较初始结构减少了7%—26%。说明该设计结构下的内部流场分配均匀且换热型性能优越。

In order to improve the heat dissipation performance of the microchannel heat sink,the flow field flow and heat transfer characteristics inside the heat sink were numerically sim-ulated using Fluent software.A new microchannel heat sink structure was also designed by adjus-ting the width of the channel and fin cross-section and adding ribbed columns and holes.At different inlet volume flow rates from 0.25 to 1.5 L/min,the extreme difference in mass flow rate in each channel of the new microchannel heat sink structure was 1/8 of the initial structure.Fluid inhomogeneous distribution factor was 9%-56%of the initial structure.The maximum substrate temperature was reduced by 6.4-8.8℃.The average substrate temperature was reduced by 7.1-10.1℃.The extreme difference of heat exchange in the high heat exchange zone was 17%-24%of the initial structure.The average Nu number was 2.1-2.4 times of the primary structure.The Rth value was reduced by 7%-26%compared with the initial structure.It showed that the internal flow field distribution was uniform and the heat transfer type performance was superior with this design structure.