喷雾冷却临界传热特性试验研究

为了进行极限热工况下的喷雾冷却传热特性研究,设计并搭建采用蒸馏水及乙醇溶液喷雾冷却试验台,分析结构参数、喷雾流量、喷雾腔内压力等对喷雾冷却临界热流密度的影响。试验结果表明:临界热流密度随槽道深度增加先增大后减小,最佳槽道深度为0.8 mm,此时临界热流密度达到326 W/cm^2;随着喷雾流量的增加,临界热流密度始终增大;喷雾腔内压力对临界热流密度基本没有影响。计算结果表明,喷雾冷却效率随槽道深度增加而提升,随喷雾流量的增加而减弱。

Experimental study on critical heat transfer characteristics of spray cooling

To study the heat transfer characteristics of spray cooling under extreme thermal conditions,a spray cooling system using distilled water and ethanol solution spray cooling is designed and established to investigate the effects of the structural parameters,spray flow rate and presure in spray chamber on the critical heat flux of spray cooing.The experimental results show that the critical heat flux first increases and then decreases with the increase of groove depth.And the optimal groove depth is 0.8 mm,when the critical heat flux reaches 326 W/cm^2.The critical heat flux always increases with the increase of spray flow rate.The pressure in spray chamber has no influence on the critical heat flux.The calculated result shows that the spray cooling efficiency increases with the increase of groove depth,but decreases with the increase of the spray flow rate.