When nuclear reactor accidents such as steam generator pipe ruptures or core melting occur, radioactive aerosols will remain in the liquid pools. Bubbles may be generated by boiling or gas injection. Film droplets produced by bubble bursts may entrain radioactive aerosols from the liquid to the air. This long-lasting behavior can produce a considerable amount of aerosols. To evaluate radioactive source terms, many physical quantities related to bubble bursting need to be determined, such as bubble burst position, bubble lifetime, cap film roll-up velocity, and cap film thickness, which are very important parameters that influence the releasing of radioactive aerosols. In this research, the phenomenon of bubble bursting was investigated by visualization. The above parameters were measured. We obtained the lifetime distribution of bubbles under different conditions, and we found that the addition of an aerosol increased the lifetime of the bubbles. By comparing the bubble lifetime to the roll-up velocity and cap thickness, we showed that the increase of the liquid temperature thickened the cap at rupture and the increase of the air temperature thinned the cap. The addition of an aerosol increased the film roll-up velocity.

中文翻译：

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带有气溶胶的液池自由表面的气泡破裂和排水特性

当发生诸如蒸汽发生器管道破裂或堆芯熔化之类的核反应堆事故时，放射性气溶胶将残留在液池中。沸腾或注气可能会产生气泡。气泡破裂产生的薄膜液滴可能将放射性气溶胶从液体夹带到空气中。这种持久的行为会产生大量的气溶胶。要评估放射源术语，需要确定许多与气泡破裂有关的物理量，例如气泡破裂位置，气泡寿命，盖膜卷起速度和盖膜厚度，这是影响放射性释放的非常重要的参数。气溶胶。在这项研究中，通过可视化研究了气泡破裂的现象。测量以上参数。我们获得了不同条件下气泡的寿命分布，并且发现添加气溶胶可以延长气泡的寿命。通过将气泡寿命与卷起速度和瓶盖厚度进行比较，我们发现，破裂时液体温度的升高会使瓶盖变厚，而空气温度的升高会使瓶盖变薄。气溶胶的添加增加了膜的卷起速度。