不同半径纤维阵列上的润湿形态
Wetting morphologies on an array of fibers of different radii
摘要：
本文研究了有限体积液体在两个不同半径的平行刚性纤维上的平衡形态。如对于相同半径的纤维所观察到的，取决于纤维间的距离，液体要么处于柱形态，要么采用液滴形状。然而，发生转变的横截面积和临界纤维间距离都被纤维的多分散性改变。使用能量的考虑，我们分析预测的临界纤维间的距离对应的柱和液滴形态之间的过渡发生。该距离取决于纤维的半径和液体的接触角。我们使用一个完全润湿的液体在两个平行的尼龙纤维上进行实验：结果与我们的分析模型吻合得很好。不同半径的纤维之间的毛细管桥的形态是相关的多分散纤维的大阵列的建模。
英文摘要：
We investigate the equilibrium morphology of a finite volume of liquid placed on two parallel rigid fibers of different radii. As observed for identical radii fibers, the liquid is either in a column morphology or adopts a drop shape depending on the inter-fiber distance. However the cross-sectional area and the critical inter-fiber distance at which the transition occurs are both modified by the polydispersity of the fibers. Using energy considerations, we analytically predict the critical inter-fiber distance corresponding to the transition between the column and the drop morphologies occurs. This distance depends both on the radii of the fibers and on the contact angle of the liquid. We perform experiments using a perfectly wetting liquid on two parallel nylon fibers: the results are in good agreement with our analytical model. The morphology of the capillary bridges between fibers of different radii is relevant to the modeling of large arrays of polydisperse fibers.
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