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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Influence of air on heat transfer of a closed-loop spray cooling system
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Influence of air on heat transfer of a closed-loop spray cooling system

机译：空气对闭环喷雾冷却系统传热的影响

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摘要

The influence of air must be considered when designing a direct spray cooling system for electronics because of its inevitable existence. In the present study, the influence of air on spray cooling is experimentally investigated with the air volume concentration ranging from 0.06 to 0.65 and the chamber total pressure from 0.44 bar to 1.07 bar. Two dielectric fluids (PF-5060 and FC-3284) are studied due to their compatibility with electronics. The results show that in the current experimental range the spray cooling is mainly affected by the liquid subcooling and surface superheat when air is present. The chamber total pressure appears to have a negligible influence on the spray cooling heat transfer, which differs from the spray cooling behavior without air. This argument holds true from the incidence of nucleate boiling to near the transition boiling regime as long as there is a sufficient amount of air present in the system. The air-entrainment-induced secondary nucleation can possibly leads to the insensitivity of the spray cooling heat transfer to the system pressure. A correlation is developed by incorporating the influence of the spray characteristics, the liquid properties, the chamber pressure, the degree of liquid subcooling, and the surface superheat. It provides a good prediction of the heat transfer rate for air-present spray cooling under current experimental conditions.
机译：由于其不可避免的存在，在为电子设备设计直接喷涂冷却系统时，必须考虑空气的影响。在本研究中，通过0.06至0.65的空气体积浓度，从0.44 bar到1.07巴的空气体积浓度，通过0.06至0.65的空气容量浓度进行实验研究。由于它们与电子器件的兼容性，研究了两个介电流液（PF-5060和FC-3284）。结果表明，在目前的实验范围内，喷雾冷却主要受液体过冷却的影响，并且当存在空气时表面过热。腔室总压力似乎对喷雾冷却热传递的影响忽略不计，这与无空气的喷雾冷却行为不同。这一论点从核心沸腾到接近过渡沸腾制度附近的情况，只要系统中存在足够量的空气即可，就可以获得核心沸腾的发生率。空气夹带诱导的次要成核可能导致喷雾冷却热传递对系统压力的不敏感性。通过掺入喷射特性，液体性质，腔室压力，液体过冷度和表面过热的影响来开发相关性。它提供了在当前实验条件下的空气当前喷雾冷却的传热速率的良好预测。

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