Short time dynamics of viscous drop spreading
Short time dynamics of viscous drop spreading
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DOI：
10.1063/1.4788693
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发表时间：
2013-01-01
影响因子：
4.6
通讯作者：
Snoeijer, J. H.
中科院分区：
文献类型：
--
作者：
Eddi, A.;Winkels, K. G.;Snoeijer, J. H.
液滴与固体基质接触后开始直接扩散。虽然这种现象涉及三相接触线，但传播运动可能非常快。我们对粘性液滴的初始扩散动力学进行了实验研究，该动力学以润湿区半径为特征。使用同步底视和侧视的高速成像，可获得长达60年的时间分辨率。我们证明了短时间传播并不呈现纯粹的幂规律增长。相反，我们发现扩散速度随时间呈对数递减，其动力学与粘性液滴聚合的动力学相同。值得注意的是，在液滴扩散的初始阶段，接触线耗散和润湿效应变得不重要。(C)2013年美国物理研究所。[http://dx.doi.org/10.1063/1.4788693]
Liquid drops start spreading directly after coming into contact with a solid substrate. Although this phenomenon involves a three-phase contact line, the spreading motion can be very fast. We experimentally study the initial spreading dynamics, characterized by the radius of the wetted area, for viscous drops. Using high-speed imaging with synchronized bottom and side views gives access to 6 decades of time resolution. We show that short time spreading does not exhibit a pure power-law growth. Instead, we find a spreading velocity that decreases logarithmically in time, with a dynamics identical to that of coalescing viscous drops. Remarkably, the contact line dissipation and wetting effects turn out to be unimportant during the initial stages of drop spreading. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4788693]