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arXiv physics/0312140physics.flu-dyn
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去湿流体力学理论

Hydrodynamic theory of de-wetting

Jens Eggers

摘要:

在润湿现象的研究中,一个典型的问题是固体浸入液体浴或从液体浴中抽出的问题。在后一种去湿情况下,存在临界速度,高于该临界速度,静止接触线不再可持续,并且液体膜沉积在固体上。证明这种行为是一个流体动力学不稳定的接触线附近,我们提供了第一个理论解释的一个经典的预测,由于Derjaguin和Levi:不稳定发生时,外部,静态弯月面接近的形状对应于一个完美的润湿流体。

英文摘要:

A prototypical problem in the study of wetting phenomena is that of a solid plunging into or being withdrawn from a liquid bath. In the latter, de-wetting case, a critical speed exists above which a stationary contact line is no longer sustainable and a liquid film is being deposited on the solid. Demonstrating this behavior to be a hydrodynamic instability close to the contact line, we provide the first theoretical explanation of a classical prediction due to Derjaguin and Levi: instability occurs when the outer, static meniscus approaches the shape corresponding to a perfectly wetting fluid.

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