Short-time dynamics of partial wetting
Short-time dynamics of partial wetting
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DOI：
10.1103/physrevlett.100.234501
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发表时间：
2008-06-13
影响因子：
8.6
通讯作者：
Stone, Howard A.
中科院分区：
文献类型：
--
作者：
Bird, James C.;Mandre, Shreyas;Stone, Howard A.
当液滴接触固体表面时，液体在固体上扩散以使总表面能最小化。最初的传播往往是迅速的。例如，一毫米大小的水滴将在一毫秒内润湿具有与水滴相同直径的区域。对于完全润湿的系统，这种扩散是惯性主导的。在这里，我们确定，即使在接触线的存在下，初始润湿是由惯性，而不是粘度为主。我们发现，扩展半径遵循幂律缩放的时间指数取决于平衡接触角。我们提出了一个模型，与实验结果相一致，在该模型中，表面扩散是由毛细波的产生调节。
When a liquid drop contacts a wettable surface, the liquid spreads over the solid to minimize the total surface energy. The first moments of spreading tend to be rapid. For example, a millimeter-sized water droplet will wet an area having the same diameter as the drop within a millisecond. For perfectly wetting systems, this spreading is inertially dominated. Here we identify that even in the presence of a contact line, the initial wetting is dominated by inertia rather than viscosity. We find that the spreading radius follows a power-law scaling in time where the exponent depends on the equilibrium contact angle. We propose a model, consistent with the experimental results, in which the surface spreading is regulated by the generation of capillary waves.