喷雾冷却换热机理研究进展

Research Progress of Spray Cooling Heat Transfer Mechanism

本文从喷雾流量、喷雾高度、喷雾倾角和喷雾待冷表面结构等方面,概括了喷雾冷却换热能力的研究进展。现有研究表明,流量、高度等参数对传热性能有不同程度的影响;以水为工质,增大流量,热流密度最高达1,200W/cm^2;从喷雾射流区、冲击液膜流动区和自由液膜流动区三个方面,综述了喷雾冷却传热模型研究进展,现有模型在一定范围内有较高吻合度,误差均在10%左右;但模型大多采用经验公式,适用范围较小,需要进一步完善;总结了现有喷雾冷却研究成果的不足之处,指出了研究方向。

In this paper,the experimental research progress of spray cooling heat transfer capability is summarized from the spray flow rate,spray height,spray angle,and spray cooling surface structure.The present research shows that the parameters such as flow rate and height have different effects on the heat transfer performance.Water is used as the working medium to increase the flow rate,and the heat flux is up to 1,200 W/cm^2.The research progress of spray cooling heat transfer model is summarized from three aspects of spray jet area,impinging liquid film flow area and free liquid membrane flow area.The existed models have a high degree of agreement within a certain range,and the errors are about 10%,but most of them adopt empirical formula and their application scope is small and needs to be further improved.The shortcomings of the existed spray cooling models are summarized,and the research direction of spray cooling is prospected.