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Experimental study on the release of droplets via bubble bursting under different liquid phase conditions
Progress in Nuclear Energy ( IF 3.3 ) Pub Date : 2020-12-31 , DOI: 10.1016/j.pnucene.2020.103617
Hao Chen , Haifeng Gu , Huanwen Lv , Xiang Yu , Junlong Wang , Hanyu Luo

When a gas passes through the surface of a liquid pool, bubbles are formed at the liquid surface.Thus, the liquid can be directly released into the atmosphere via bubble bursting above the pool surface.This phenomenon is prevalent in several fields, such as chemical industries marine aerosol environments, and nuclear engineering.If a liquid pool contains aerosols, the aforementioned phenomenon will directly become a means of releasing the through fall droplets.This is an important mechanism for releasing liquids and aerosols from pools.Therefore, it is important to study the phenomenon of bubble bursting and to derive the distribution of droplets to evaluate the mechanism of release.With this objective, an experimental visualization platform was designed; the process of bubble bursting was photographed using a high-speed camera,and the images were processed to obtain the distributions of the droplets released.The results shows that hundreds of droplets are formed via bubble bursting at the surface of the liquid, and the distribution of the droplets is different under different conditions of the liquid.In distilled water, the number of droplets formed via bubble bursting is less than in regular water, while the sizes of the droplets increase with an increase in temperature.Furthermore, in a suspension of TiO2at a temperature of about 16 °C, the mass concentration is not a key factor inthe release of the droplets.However, at high temperatures of about 50 °C and 77 °C,with an increasing mass concentration ofTiO2, the number of droplets formed via bubble bursting increases, while the dropletsizes decrease.This indicates that with an increase in the concentration of aerosols, more droplets and aerosols will be released via bubble bursting.



中文翻译:

不同液相条件下气泡破裂释放液滴的实验研究

当气体通过液体池的表面时,在液体表面会形成气泡,因此液体可以通过气泡在池表面上方破裂而直接释放到大气中,这种现象在化学等领域很普遍。工业上的海洋气溶胶环境和核工程。如果液池中包含气溶胶,则上述现象将直接成为释放通过下落的液滴的手段,这是从池中释放液体和气溶胶的重要机制。研究气泡破裂现象并推导液滴分布,以评价释放机理。为此,设计了一个实验可视化平台。使用高速相机拍摄了气泡破裂的过程,2在约16°C的温度下,质量浓度不是液滴释放的关键因素。但是,在约50°C和77°C的高温下,随着TiO 2的质量浓度增加,气泡破裂形成的液滴增加而液滴尺寸减小,这表明随着气溶胶浓度的增加,气泡破裂会释放出更多的液滴和气溶胶。

更新日期:2020-12-31
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