Controllable self-transport of bouncing droplets on ultraslippery surfaces with wedge-shaped grooves

Droplet Pub Date : 2024-03-22 DOI:10.1002/dro2.118

Chuchen Yue, Qingwen Dai, Xiaolong Yang, Carsten Gachot, Wei Huang, Xiaolei Wang

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Abstract

Preventing the accretion of droplets on surfaces is vital and slippery liquid-infused porous surfaces (SLIPS) have promising application prospects, such as surface self-cleaning and droplet transportation. In this work, controllable self-transport of bouncing droplets on ultraslippery surfaces with wedge-shaped grooves is reported. The impact behaviors of droplets on SLIPS under various impact velocities and diameters are explored, which can be classified as hover, total bounce, partial bounce, Worthington jet, and crush. SLIPS with wedge-shaped grooves were designed to transport accreted droplets. An energy and transport model is established to explain the impact and self-transport mechanism, where the Laplace pressure and moving resistance between droplets play a key role. Finally, SLIPS with branched wedge-shaped grooves were designed for droplet self-transport and demonstrated advantages. This work provides a general reference for spontaneous motion control of sessile droplets, droplets with initial impacting velocity, or even liquid films.

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带楔形凹槽的超光滑表面上弹跳液滴的可控自传输

防止液滴在表面上聚集至关重要，而注入液体的多孔湿滑表面（SLIPS）在表面自清洁和液滴传输等方面具有广阔的应用前景。在这项工作中，报告了弹跳液滴在带有楔形凹槽的超滑表面上的可控自传输。研究探讨了不同冲击速度和直径下液滴在 SLIPS 上的冲击行为，可分为悬停、完全反弹、部分反弹、沃辛顿射流和挤压。设计了带有楔形凹槽的 SLIPS，以输送吸附的液滴。建立了一个能量和传输模型来解释撞击和自传输机制，其中液滴间的拉普拉斯压力和移动阻力起着关键作用。最后，针对液滴的自传输设计了具有分支楔形凹槽的 SLIPS，并展示了其优势。这项工作为无柄液滴、具有初始冲击速度的液滴甚至液膜的自发运动控制提供了一般参考。

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