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以水为冷却介质,针对固体激光器200 W/cm2散热需求进行喷雾冷却换热实验研究,重点研究介质体积通量在0.044~0.053 m3/(m2.s),壁面温度为25~65℃范围内“无沸腾区”的散热特性。实验结果表明,通量为0.044 m3/(m2.s),壁面温度为65℃时,散热功率可达257 W/cm2;在通量为0.053 m3/(m2.s)时,保持同样壁面温度散热能力达到300 W/cm2。对实验数据进行分析发现,“无沸腾区”换热系数随着介质体积通量、壁面温度的增加而变大;对雷诺数Re>440给出了反映换热特性的Nu与Re经验关系式。与Oliphant等给出的数据比较后发现,此关系式在Re>240以后的计算结果,对工程运用亦有一定的参考作用。
Taking water as the cooling medium, the experiment of spray cooling and heat transfer was carried out according to the requirement of heat radiation of 200 W / cm2 solid laser. The study focused on the study of medium volume flux of 0.044 ~ 0.053 m3 / (m2.s) and wall temperature of 25 ~ 65 ℃ “No boiling area ” cooling characteristics. The experimental results show that the cooling power reaches 257 W / cm2 when the flux is 0.044 m3 / (m2.s) and the wall temperature is 65 ℃. When the flux is 0.053 m3 / (m2.s), the same wall temperature Cooling capacity of 300 W / cm2. Analysis of the experimental data shows that the heat transfer coefficient of “no boiling zone” becomes larger with the increase of medium volume flux and wall temperature. Nu and Re’s experience reflecting the heat transfer characteristics is given for Reynolds number Re> 440 Relationship. Compared with the data given by Oliphant et al., It is found that the result of the calculation after Re> 240 also has certain reference for engineering application.