Droplet impact on doubly re-entrant structures.
Droplet impact on doubly re-entrant structures.
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DOI：
10.1038/s41598-024-52951-2
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发表时间：
2024-02-01
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
--
作者：
与直柱或回入柱相比，双回入柱已被证明对高度可湿性液体具有优越的静态和动态拒水性。然而，对于双重入柱的关键结构参数如何影响撞击液滴的流体动力学，人们知之甚少。在这项工作中，我们进行了数值模拟和实验研究，以描述可以解释通过调整双重入柱的设计参数来改变表面润湿性的基本物理现象。一方面，进行了液滴冲击的三维多相流模拟，探讨了悬垂结构在动态驱液中的优势；另一方面，在不同间距和接触角条件下，液滴碰撞行为的数值模拟结果与实验结果一致。此外，还改变了双重入柱的尺寸，包括高度、直径、悬垂长度和悬垂厚度，以确定它们对液滴驱避的影响。这些发现为通过改善双重入结构的关键尺寸参数来操纵液滴行为提供了机会。
Doubly re-entrant pillars have been demonstrated to possess superior static and dynamic liquid repellency against highly wettable liquids compared to straight or re-entrant pillars. Nevertheless, there has been little insight into how the key structural parameters of doubly re-entrant pillars influence the hydrodynamics of impacting droplets. In this work, we carried out numerical simulations and experimental studies to portray the fundamental physical phenomena that can explain the alteration of the surface wettability from adjusting the design parameters of the doubly re-entrant pillars. On the one hand, three-dimensional multiphase flow simulations of droplet impact were conducted to probe the predominance of the overhang structure in dynamic liquid repellency. On the other hand, the numerical results of droplet impact behaviours are agreed by the experimental results for different pitch sizes and contact angles. Furthermore, the dimensions of the doubly re-entrant pillars, including the height, diameter, overhang length and overhang thickness, were altered to establish their effect on droplet repellency. These findings present the opportunity for manipulations of droplet behaviours by means of improving the critical dimensional parameters of doubly re-entrant structures.
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DOI：
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发表时间：
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影响因子：
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通讯作者：
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