微结构表面喷雾冷却性能试验研究
网络出版日期: 2017-03-20
Heat Transfer Characteristics of Spray Cooling on#br# Micro-structured Surface
Online published: 2017-03-20
搭建一套封闭式喷雾冷却试验系统，使用水作为冷却工质，结合高速摄像仪对试验进行可视化研究，分析对比光滑表面和微结构表面喷雾冷却换热特性。结果发现，相比光滑表面，不同几何形貌的微结构表面都能提高喷雾冷却的换热能力，其中换热最好的是方形肋表面，直肋表面次之，扇形肋表面较差，但均优于光滑表面。微结构表面的润湿性强于光滑表面，微结构的存在能够提高喷雾冷却热流密度，使喷雾冷却提前进入两相区，避免了沸腾的滞后性。不同形式的微结构表面表现出不同的换热效果，主要是因为微结构表面对换热的强化不仅和面积增幅有关，还与微槽的紧密程度和排列方式有关。此外，试验中发现喷雾冷却存在温度不均匀现象，且微结构表面温度不均匀性大于光滑表面，但是降低系统压力，这种温度不均匀性可以得到明显改善。
刘妮 , 李丽荣 , 钟泽民 . 微结构表面喷雾冷却性能试验研究[J]. 机械工程学报, 2017 , 53(6) : 158 -165 . DOI: 10.3901/JME.2017.06.158
Experiments are conducted to study the heat transfer characteristics of micro-structure and flat surface in spray cooling. The micro-structured surfaces including square pin fins,straight rectangular fins and fan fins along with a referenced flat surface are tested in a closed loop system with water as the working fluid. The experimental results indicate that the fin arrangement rather than a simple increased wetted area plays significant role on the spray cooling performance of the micro-structure surface. Using a flat surface as reference,the micro-structured surface produced more or less enhancement in spray cooling than the flat surface. The micro-structure is indicated can improve the heat flux,acquired higher CHF. In addition,to improve heat transfer,the micro-structure surface provides other advantages such as reducing the time of transition to two phase regime. And the micro-structure surface with square pin fins outperformed the surface with straight rectangular fins and fan fins. However,there exists a relative more serious temperature non-uniformity phenomenon on the enhanced surface than flat surface,and it can be improved by reducing the system pressure.
Key words： spray cooling; micro-structure surface; CHF; temperature non-uniformity
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