Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China; State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China.
Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China.
J Colloid Interface Sci. 2019 Apr 1;541:56-64. doi: 10.1016/j.jcis.2019.01.070. Epub 2019 Jan 18.
Flying in the rain presents a greater challenge for smaller animals such as kingfishers, compared with aircraft in the same situation. Regardless, kingfishers have developed advanced water repellency as reflected in the hydrophobicity and elasticity of their feathers. Therefore, it is possible to confirm that the elastic superhydrophobic surface can enhance the water repellency of the surface by experimental and theoretical analysis.
A simplified device simulating droplet impact on a kingfisher feather was configured for comparison. Moreover, the dynamic behavior of droplets (with varying Weber numbers-2 ≤ W ≤ 42) impinging on the elastic and rigid substrate was analyzed, such as spreading, retraction, lift-off, the secondary droplet, and contact time with a high-speed camera.
The elastic substrate significantly affected the retraction and lift-off of the droplet-that is, an earlier and more efficient morphological rearrangement of the droplet-reducing the contact time by up to 8.3% (17 < W ≤ 32). The combination of elasticity and hydrophobicity is a new bioinspired strategy that provides an insight into one of the mechanisms by which birds flying in the rain cannot be bedewed while guiding the design of water-repellent surfaces.
与同样情况下的飞机相比，在雨中飞行对翠鸟等较小的动物来说是一个更大的挑战。尽管如此，翠鸟已经发展出了先进的防水性，这反映在它们羽毛的疏水性和弹性上。因此，可以通过实验和理论分析来证实弹性超疏水表面可以增强表面的防水性。
配置了一个简化的装置来模拟液滴对翠鸟羽毛的冲击，以进行比较。此外，还分析了具有不同韦伯数（-2≤W≤42）的液滴（液滴）冲击弹性和刚性基底的动态行为，例如铺展、回缩、脱离、二次液滴和高速相机的接触时间。
弹性基底显著影响液滴的回缩和脱离，即液滴的形态更早期、更有效地重新排列，从而将接触时间缩短了多达 8.3%（17<W≤32）。弹性和疏水性的结合是一种新的仿生策略，为鸟类在雨中飞行而不被打湿的机制之一提供了深入了解，并为设计防水表面提供了指导。
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