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本文以氮气和去离子水为工质,对微针肋热沉两相流动形态及压降特性进行了初步研究。结果发现低气液流速时表面张力作用明显占优,气泡在肋之间存在时间不一的停滞现象;随着液相流速的增加,由于表面张力所起作用的变化以及两相流型的转变,试验所得分相模型系数C的分布,发生了两次明显转变;考虑当量直径影响的M-H分相模型对试验值预测效果最好,平均偏差只有9.27%,液相流速很小时,L-Mu模型效果较好。
In this paper, nitrogen and deionized water as working fluid, micro-pinhole heat sink two phase flow morphology and pressure drop characteristics of a preliminary study. The results show that the surface tension is obviously dominant when the gas-liquid velocity is low, and the stagnation of gas bubbles in the ribs varies with time. With the increase of the liquid velocity, the change of the surface tension and the change of the two-phase flow pattern , The distribution of phase coefficient C of the experimental score changed obviously twice. The MH phase separation model, which considered the equivalent diameter, had the best prediction effect on experimental values with an average deviation of 9.27%. When the liquid flow velocity was small, L-Mu The model is better.