In this paper, oblique impact of a single rain droplet on super-hydrophobic surface with randomly distributed rough structures was investigated by lattice Boltzmann method. The effects of the impact angle of the droplet as well as the skewness and kurtosis of rough surface on the bouncing ability of the droplet were in this paper. It was found that the oblique impact can effectively reduce the contact time in the process of droplet bouncing off, because the energy consumption caused by the pinning effect is reduced. Moreover, the contact time most possibly reaches the shortest when the impact angle is 45°. Decreasing the skewness and keeping the kurtosis around 4.0 can enhance the bouncing ability during the droplet oblique impact on randomly distributed rough surfaces. The results are useful for the design of building structures.

中文翻译：

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随机分布的粗糙结构对超疏水性表面上单个雨滴的倾斜影响的格子Boltzmann模拟

本文采用晶格玻尔兹曼方法研究了单个雨滴对具有随机分布的粗糙结构的超疏水表面的倾斜影响。本文研究了液滴的冲击角，粗糙表面的偏斜度和峰度对液滴弹跳能力的影响。已经发现，由于减小了钉扎效应引起的能量消耗，因此倾斜冲击可以有效地减少液滴弹回过程中的接触时间。此外，当冲击角为45°时，接触时间最有可能达到最短。减小倾斜度并将峰度保持在4.0左右可以增强液滴倾斜撞击随机分布的粗糙表面时的弹跳能力。结果对于建筑结构的设计是有用的。