喷雾冷却临界热流密度模型及其影响因素研究进展

Study progress of CHF model and influencing factors in spray cooling

喷雾冷却是解决电子元器件等高热流密度散热问题的关键技术。CHF(临界热流密度)对应着喷雾冷却换热曲线的最高点,代表了喷雾冷却的最大换热能力,对指导喷雾冷却的实际应用和偏小冷却系统体积均具有重要意义。本文综述了国内外现有的CHF理论模型和经验模型,分析了喷嘴特性、喷雾倾角、热源表面结构和循环工质类型对CHF的影响,指出了今后的研究方向。

Spray cooling has excellent heat exchange performance, and it is the key technique in the field of electronic cooling which requires low and uniform surface temperature and high heat flux. Critical heat flux（CHF） corresponds to the highest point of the heat transfer curve of spray cooling, it represents the maximum heat transfer capability and provides important guidance for both practical application of spray cooling and reduction of the volume of the system. For more thorough study and more accurate prediction of spray cooling CHF, this paper summarizes the existing CHF theory and empirical model at home and abroad, and the effects of the characteristics of the nozzle, the spray angle, the surface structure of the heat source and the type of the cooling fluid on the CHF are analyzed. Study direction in future is pointed out.