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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。
Using water as the working fluid, air-assisted atomization and no-boiling spray cooling experiments were conducted under the condition of maintaining the heat flux density and the inlet water temperature unchanged. The effects of liquid flow rate, pressure and gas flow parameters on the s-drop diameter dSMD of atomized droplets were analyzed. The influence of heat transfer capacity and heat transfer surface temperature uniformity was further studied. The experimental results show that when the gas-liquid mass flow rate is higher than 5%, the gas-liquid pressure is quite high, which can achieve the optimal match between gas-liquid relative velocity, gas kinetic energy utilization rate and gas consumption rate, and the best heat exchange effect can be obtained. The pressure is slightly lower than the gas pressure, can get better temperature uniformity; gas-liquid mass flow rate of less than 5%, the gas pressure slightly higher than the liquid pressure to ensure the utilization of gas kinetic energy at the same time improve the gas-liquid relative speed, optimization Liquid atomization and droplet distribution, get the best heat transfer performance and temperature uniformity.