高功率固体激光器用气助式雾化无沸腾换热性能的实验研究

以水为工质，在维持热流密度及进口水温不变的条件下，进行气助式雾化无沸腾喷雾冷却实验。分析了液体流量、压力以及气体流动参数对雾化液滴索太尔直径dSMD的影响，并进一步研究了其对换热能力及换热表面温度均匀性的影响。实验结果表明气液质量流量比高于5%时，气液压力相当，可以实现气液相对速度、气体动能利用率、气耗率的最优匹配，可以得到最好的换热效果，而液体压力略低于气体压力，可以得到较好的温度均匀性；气液质量流量比低于5%时，气体压力略高于液体压力，保证气体动能利用率的同时提高了气液相对速度，优化了液体雾化和雾滴分布，得到了最好的换热性能和温度均匀性。

Abstract

Keeping the heat flux density and the temperature of water at inlet constant, cooling experiments on non-boiling heat transfer with air-assist atomization are carried out. The influences of liquid mass flow rate and pressure, air to liquid ratio and nitrogen pressure on sauter diameter dSMD are analyzed. The heat transfer capacity and temperature uniformity are further studied respectively. The results show that when the air-liquid mass flow ratio is above 5%, the same nitrogen and liquid pressure can get a better heat transfer due to optimal match of gas-liquid relative velocity, the nitrogen kinetic energy utilization and gas consumption rate, and as the liquid pressure is slightly lower than the nitrogen pressure uniform temperature distribution can be achieved. When the air-liquid mass flow ratio is below 5%, a better heat transfer and temperature distribution can be gotten under the condition of the nitrogen pressure slightly higher than the liquid pressure, which ensure the utilization of gas kinetic energy while increase the relative velocity and optimize the droplet atomization and distribution.

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司春强, 徐洪波, 唐明生, 田长青. 高功率固体激光器用气助式雾化无沸腾换热性能的实验研究[J]. 光学学报, 2010, 30(10): 2958. Si Chunqiang, Xu Hongbo, Tang Mingsheng, Tian Changqing. Experimental Study on Non-Boiling Heat Transfer with Air-Assist Atomization for High-Power Laser[J]. Acta Optica Sinica, 2010, 30(10): 2958.

高功率固体激光器用气助式雾化无沸腾换热性能的实验研究

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