Spray cooling of high power diode laser
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摘要: 通过以液氨为制冷工质的开式喷雾冷却系统,在相同实验条件下研究了二极管激光器（DL）热沉喷雾表面分别为光滑表面、均匀密排微孔、深孔和多孔表面结构时的冷却效果,实验结果表明：在热流密度达到300 W/cm2时,冷却表面温度均保持在28 ℃以内,适用于高热流密度下的DL热管理问题；喷雾表面均布微结构能显著强化喷雾冷却性能,当采用均匀密排多孔表面时,散热功率达511.5 W/cm2,对流传热系数为346 701.1 W/(m2℃),传热系数较光滑表面时提高了83.9%。Abstract: Spray cooling experiments were performed on the heater with different micro-structured surfaces. A smooth surface was also tested for comparison. The micro-structures consisted of uniform porous tunnels with different size, and tests were conducted in an open system with ammonia as the working fluid. When the heat flux was 300 W/cm2, the surfaces temperature was kept below 28 ℃. This result indicated that ammonia was a optional fluid for diode laser cooling application. Moreover, the uniform micro-structured surfaces offered significant performance enhancement of heat transfer. At 511.5 W/cm2, heat transfer coefficient reached to 346 701.1 W/(m2℃) which corresponded to 83.9% increase over smooth surface.
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Key words:
- diode laser /
- thermal management /
- spray cooling /
- micro-structured surfaces /
- heat transfer enhancement
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