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arXiv physics/0501096physics.flu-dyn
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动接触网的不稳定性

Instability of a moving contact line

Jens Eggers

摘要:

我们研究一个固体板陷入或退出一个液体浴,突出的基本区别的局部行为的前进或后退的接触线,分别。假设液体部分润湿固体,在平衡时形成有限的接触角。在我们的流体动力学描述中,忽略了外部气体气氛的存在,前进的动态润湿线持续到任意高的速度。另一方面,后退润湿线在由粘性力和表面张力力之间的竞争设定的临界速度处消失。在前进的情况下,我们应用现有的匹配技术的暴跌板的几何形状,显着改善现有的理论。对于后退的接触线,我们证明了第一次如何本地接触线的解决方案可以匹配到远场弯月面。在这样做的时候,我们确认我们最近的后退接触线的不稳定性的标准。前进和后退的情况下的结果进行了测试,对模拟的完整模型方程。

英文摘要:

We study a solid plate plunging into or being withdrawn from a liquid bath, to highlight the fundamental difference between the local behavior of an advancing or a receding contact line, respectively. It is assumed that the liquid partially wets the solid, making a finite contact angle in equilibrium. In our hydrodynamic description which neglects the presence of the outer gas atmosphere, an advancing dynamic wetting line persists to arbitrarily high speeds. The receding wetting line, on the other hand, vanishes at a critical speed set by the competition between viscous and surface tension forces. In the advancing case, we apply existing matching techniques to the plunging plate geometry, to significantly improve on existing theories. For the receding contact line, we demonstrate for the first time how the local contact line solution can be matched to the far-field meniscus. In doing so, we confirm our very recent criterion for the instability of the receding contact line. The results of both the advancing and the receding cases are tested against simulations of the full model equations.

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