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本文设计搭建了静态闪蒸实验台,对NaCl溶液静态闪蒸过程中的汽泡成长进行了可视化实验研究。实验中,液膜初始浓度为0~0.2,初始温度93~96℃,真空腔初始压力0.01~0.03 MPa。结果表明:真空腔初始压力的降低,对汽泡相对半径的变化率起到促进作用。NaCl溶液中汽泡相对半径的变化较纯水中更加快速,但在不同浓度的溶液中这一变化并不明显。同时建立了物理模型,并对该模型进行了数值计算,得到数值解。所得的计算值基本与实验值相趋势基本一致但还有待改进。
In this paper, a static flash experiment bench was designed and constructed to study the bubble growth in the static flash of NaCl solution. In experiment, the initial concentration of liquid film is 0 ~ 0.2, the initial temperature is 93 ~ 96 ℃ and the initial pressure of vacuum chamber is 0.01 ~ 0.03 MPa. The results show that the decrease of the initial pressure in the vacuum chamber can promote the rate of change of relative radius of bubble. The change of relative bubble radius in NaCl solution is faster than that in pure water, but this change is not obvious in different concentration solutions. At the same time, a physical model is established, and the numerical calculation of the model is carried out to obtain the numerical solution. The calculated value is basically the same with the experimental phase trend but still needs improvement.