Jia Xuhong, Luo Yuzhen, Huang Rui, Zhu Xinhua, Zhang Yuqiang, Liu Quanyi
College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Guanghan, China.
Sci Rep. 2021 Jan 13;11(1):1148. doi: 10.1038/s41598-020-80932-8.
A new method for studying the two-dimensional spreading properties and sealing characteristics of surfactant solution on oil surface was provided. The actual spreading situation of the C4-Br/oil systems in axisymmetric geometry was observed directly using HD camera for the first time and the results showed that the aqueous film expanded outwards in a circle with the guiding device as the center. Meanwhile, the relation between spreading radius and time was investigated and evaluated using the model for surface-tension-viscous regime. The root-mean-square deviation (RMSD) values obtained from the correlation for all of the systems we studied below 1.64, indicating a good agreement between the experimental and theoretical values. The results of sealing experiments showed that the aqueous film could absolutely seal the oil surface for 27-65 s and the sealing effect would be lost after 216-742 s for different systems. The stronger the volatility was, the shorter the sealing time was. Additionally, the volume percentage of oil vapor with film was always lower than that without film even when the evaporation was saturated. These findings were of great significance to guide the preparation of efficient AFFF.
提供了一种研究表面活性剂溶液在油面上二维铺展特性和封闭特性的新方法。首次使用高清摄像机直接观察了轴对称几何形状下C4-Br/油体系的实际铺展情况，结果表明水膜以导向装置为中心呈圆形向外扩展。同时，利用表面张力-粘性 regime模型研究并评估了铺展半径与时间的关系。我们研究的所有体系相关性得到的均方根偏差（RMSD）值低于1.64，表明实验值与理论值吻合良好。封闭实验结果表明，不同体系的水膜能绝对封闭油面27-65秒，216-742秒后封闭效果消失。挥发性越强，封闭时间越短。此外，即使蒸发达到饱和，有膜时油蒸气的体积百分比也总是低于无膜时。这些发现对指导高效水成膜泡沫灭火剂的制备具有重要意义。
