Wetting and wrapping of a floating droplet by a thin elastic filament
Wetting and wrapping of a floating droplet by a thin elastic filament
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细弹性丝对漂浮液滴的润湿和包裹
DOI：
10.1039/d0sm01863e
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发表时间：
2021
期刊：
影响因子：
3.4
通讯作者：
Govindarajan, Rama
中科院分区：
文献类型：
--
作者：
Prasath, S Ganga;Marthelot, Joel;Menon, Narayanan;Govindarajan, Rama
我们研究了另一种不混溶流体的液滴对漂浮在流体表面上的弹性细丝的润湿。这个准二维实验系统是低维对应的润湿和包裹液滴的弹性片。该系统的简单性使我们能够通过测量作为细丝的弹性、施加的张力和液滴的曲率的函数的接触角来研究液滴的部分润湿和包裹的现象。我们发现，一个纯粹的几何理论给出了一个很好的描述系统中的力学平衡。施加的张力和细丝中的张力的估计服从杨-拉普拉斯-杜普雷关系的弹性版本。然而，接近接触线的曲率没有被几何理论捕获，可能是因为接触线处的3D效应。我们还发现，当高度可弯曲的细丝完全包裹液滴时，在液滴-细丝界面处存在曲率的连续性，导致如在3D液滴中观察到的无缝包裹。
We study the wetting of a thin elastic filament floating on a fluid surface by a droplet of another, immiscible fluid. This quasi-2D experimental system is the lower-dimensional counterpart of the wetting and wrapping of a droplet by an elastic sheet. The simplicity of this system allows us to study the phenomenology of partial wetting and wrapping of the droplet by measuring angles of contact as a function of the elasticity of the filament, the applied tension and the curvature of the droplet. We find that a purely geometric theory gives a good description of the mechanical equilibria in the system. The estimates of applied tension and tension in the filament obey an elastic version of the Young–Laplace–Dupré relation. However, curvatures close to the contact line are not captured by the geometric theory, possibly because of 3D effects at the contact line. We also find that when a highly-bendable filament completely wraps the droplet, there is continuity of curvature at the droplet-filament interface, leading to seamless wrapping as observed in a 3D droplet.