论文标题
加速三相移动接触线时降低接触角
Decreasing contact angles at accelerating three-phase moving contact lines
论文作者
论文摘要
我们考虑将液体滴在光滑的均质固体基材上，因为它从静止状态扩散到最终的平衡状态。在模型的框架中，对问题进行了数值研究，在模型的框架中，液滴的自由表面与底物形成的接触角未作为接触速度速度的函数规定，必须作为解决方案的一部分找到。结果表明，在自发扩散中，随着跌落开始移动并且接触线的加速，动态接触角会随着接触线速度的降低，这与自发润湿报告上的实验观察结果一致，尽管这与大多数模型中假定的旨在描述对“强制”扩散的实验相反。详细讨论了基于有限元素的算法中该模型实施的非平凡方面。
We consider a liquid drop placed on a smooth homogeneous solid substrate as it spreads from rest to its eventual equilibrium state. The problem is studied numerically in the framework of a model where the contact angle formed by the drop's free surface with the substrate is not prescribed as a function of the contact-line speed and has to be found as part of the solution. It is shown that in this spontaneous spreading, as the drop starts moving and the contact line accelerates, the dynamic contact angle decreases with the contact-line speed, which is in line with what experimental observations on spontaneous wetting report, though it is contrary to what is assumed in most models aimed at describing experiments on the "forced" spreading. Nontrivial aspects of the implementation of the model in a finite-element-based algorithm are discussed in detail.
