基于类水滴状微结构的微通道流动和散热性能研究

Study on flow and heat dissipation performance of microchannels based on droplet like microstructure

摘要:

为了能够有效提高微通道散热器的散热性能，设计了一种含有类水滴状微结构的微通道散热器,并采用仿真模拟方法来研究微通道内类水滴状微结构数量和高度变化对微通道的压力损失和散热性能的影响。在热流密度为100,入口端流体速度为1m/s的条件下，设计9组不同的含类水滴状微结构微通道。其中的5组通过改变单条微通道内类水滴状微结构的数量进行研究，得出当微结构数量为7时微通道的综合散热性能最优，其微通道底面平均温度下降了18.42K，散热系数提高了37.63%。同时在微结构数量为7的基础上再次设计4组微通道，来研究微结构的高度对微通道散热性能的影响，得出各微结构的高度沿流体流动方向逐次增高时，散热系数几乎不变，压力损失降低了11.93%。

Abstract:

The reasonable design of the microstructure can effectively improve the heat dissipation performance of the microchannel radiator. In this paper, a microchannel radiator with droplet like microstructure is designed, and the influence of the number and height of the droplet like microstructure on the pressure loss and heat dissipation performance of the microchannel is studied by simulation method. In this paper, under the condition that the heat flux is 100W/cm^2 and the fluid velocity at the inlet is 1m/s, 9 groups of different microchannels with droplet like microstructure are designed. Five groups were studied by changing the number of droplet like microstructures in a single microchannel. It was found that when the number of microstructures was 7, the comprehensive heat dissipation performance of the microchannel was the best, and the average temperature of the bottom of the microchannel decreased by 18.42K, and the heat dissipation coefficient increased by 37.63%. At the same time, four groups of microchannels were designed based on the number of 7 microstructures to study the influence of the height of the microstructures on the heat dissipation performance of the microchannels. When the height of each microstructure in the microchannels increased along the flow direction, the heat dissipation coefficient of the microchannels was basically unchanged, while the pressure loss was reduced by 11.93%.