高功率激光器喷雾冷却的实验研究
Experimental study on spray cooling for high-power laser
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摘要: 以水为冷却介质，采用Spray公司的TG0.3机械雾化实心圆锥喷嘴，在体积通量为0.044，0.049和0.053 m3/(m2·s)情况下，对刻有不同微结构槽道冷却面的无沸腾区换热性能进行实验研究。结果表明：刻有微结构的表面可明显增强换热效果；壁面刻有高为0.2 mm的微结构槽道且壁面温度为52 ℃时，体积通量为0.044 m3/(m2·s则热流可达260 W/cm2，通量为0.053 m3/(m2·s则散热功率高达376 W/cm2，完全可以满足当前高功率激光器的散热需求。对于光滑面以及槽肋高为0.1和0.2 mm的换热面，其换热能力随着体积通量的增加而增强；换热面高度为0.4 mm时，通量对换热的影响变得较微弱。微结构槽道不仅增加了换热面积，还有利于液膜扩散，减小液膜厚度，增强换热。在三种不同的流量通量下，高度为0.2 mm的微结构槽道换热性能最佳。Abstract: Using water as coolant, TG0.3 full-cone nozzles supplied by Spraying Systems Co. are applied to study heat transfer performance of micro-channel surface in non-boiling regime of spray cooling when volumetric flux ranges from 0.044 m3/(m2·s to 0.053 m3/(m2·s. The results indicate that heat transfer is obviously enhanced for micro-channel surfaces relative to the flat surface. It is found that when the wall temperature is 52 ℃ and the volumetric flux is 0.044 m3/(m2·s, the heat flux dissipated on micro-channel surface, whose fin height is 0.2 mm, could reach 260 W/cm2; when the volumetric flux increases to 0.053 m3/(m2·s, the heat flux could reach 376 W/cm2 at the same surface temperature. For the sm
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Key words:
- spray cooling /
- enhanced surface /
- non-boiling regime /
- fin height
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