局部热点射流式微通道流动沸腾实验研究

Experimental Study on Localized Hot Spot Jet Impingement Flow Boiling

本文提出了一种射流式微通道热沉用以解决高热流密度热点散热问题。以氨为工质,开展流动沸腾实验,研究对比了微通道与驻点区结构对热沉性能的影响。优化所得的“四周针肋+中心多圆锥”热沉在1 mm×6 mm热点区域752 W·cm^(-2)的热负载下,可维持热源加热面温度低于57.1℃,对应热阻0.69 K·W^(-1),压损5.1 k Pa。针对优选热沉开展的串联实验研究表明,上游热沉热负载的改变会导致下游热沉入口干度变化,进而影响其流动换热性能。

This paper proposed a jet-impingement microchannel heat sink to address high-heat-flux hot spot cooling issues.Using ammonia as the working fuid,flow boiling experiments were conducted to comparatively study the impact of microchannels and stagnation point structures on the heat sink's performance.The optimized configuration,comprising peripheral pin fins and central multi-cone,effectively dissipated a heat load of 752 W·cm^(-2)within a 1 mm×6 mm hot spot area,maintaining the heating surface temperature below 57.1℃.The corresponding thermal resistance and pressure drop were 0.69 K·W^(-1)and 5.1 kPa,respectively.Subsequent experimentation on this optimized heat sink revealed that variations in the heat load upstream significantly influenced the inlet quality of the downstream heat sink,consequently impacting its thermal-hydraulic performance.