以乙醇溶液为冷却工质的开式喷雾冷却系统实验研究

发布时间：2018-04-23 22:21

本文选题：喷雾冷却技术 + 热流密度　；参考：《低温工程》2017年03期

【摘要】：在开式循环喷雾冷却系统上研究质量分数分别为10%、20%、30%、50%、70%、99%的乙醇溶液对喷雾冷却效果影响,结果表明:热沉表面热流密度和传热系数先随乙醇水溶液浓度的增大先增大,当乙醇质量分数为50%时达到最大值,随后随乙醇浓度的增大而减小。体积流量0.944 46L/min,乙醇质量分数为50%时,喷雾冷却传热系数为6.41 W/(cm~2·K),热流密度为216.04W/cm~2,较之纯水传热系数增加了34.95%,热流密度增加了24.9%。结果表明使用乙醇溶液作为冷却剂的喷雾冷却系统能同时满足高热流密度和低换热表面温度的要求,具有良好、稳定的换热冷却能力。推导了反映介质喷雾特性和蒸发强度对换热影响的光滑表面量纲一换热准则方程,涉及的物理参量较少,因此可方便用于工程设计。
[Abstract]:In the open cycle spray cooling system, the effect of ethanol solution with a mass fraction of 10% and 30% to 70% on the spray cooling effect was studied. The results showed that the heat flux and heat transfer coefficient of the heat sink surface first increased with the increase of the concentration of ethanol aqueous solution. When the mass fraction of ethanol is 50, it reaches the maximum value, and then decreases with the increase of ethanol concentration. The heat transfer coefficient of spray cooling is 6.41 W/(cm~2 / min and the heat flux is 216.04 W / cm ~ (-2) when the volume flow rate is 0.944 L / min and the mass fraction of ethanol is 50%, which is 34.95% higher than that of pure water. The results show that the spray cooling system using ethanol solution as coolant can meet the requirements of both high heat flux and low heat transfer surface temperature, and has good and stable heat transfer cooling ability. The dimensionality heat transfer criterion equation of smooth surface which reflects the influence of spray characteristics and evaporation intensity on heat transfer is derived. The physical parameters involved are less, so it is convenient to use in engineering design.
【作者单位】：南京航空航天大学航空宇航学院;南京工业大学城市建设学院;
【分类号】：TB657

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