液滴内弹性杆的弹性毛细管盘绕
Elastocapillary coiling of an elastic rod inside a drop
摘要：
作用在液滴表面的毛细力可以强到足以使小物体变形，并且最近的研究提供了由表面张力引起的弹性不稳定性的几个例子。我们提出了这样一个例子，液滴坐在一个直的纤维，我们表明，液体吸引的纤维，从而线圈内下降。我们推导了系统的平衡方程，计算了分叉曲线，并显示了填充的纤维可以采用几种可能的配置内的下降。我们使用系统的能量来区分不同的配置，并发现随着越来越多的纤维被驱动到液滴内部，二维和三维解决方案之间存在间歇性机制。
英文摘要：
Capillary forces acting at the surface of a liquid drop can be strong enough to deform small objects and recent studies have provided several examples of elastic instabilities induced by surface tension. We present such an example where a liquid drop sits on a straight fiber, and we show that the liquid attracts the fiber which thereby coils inside the drop. We derive the equilibrium equations for the system, compute bifurcation curves, and show the packed fiber may adopt several possible configurations inside the drop. We use the energy of the system to discriminate between the different configurations and find a intermittent regime between two-dimensional and three-dimensional solutions as more and more fiber is driven inside the drop.
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