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arXiv 2012.05941physics.flu-dyn
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太快而不能生长:悬垂液滴在薄膜上滑动的动力学

Too fast to grow: Dynamics of pendant drops sliding on a thin film

Etienne Jambon-Puillet, Pier Giuseppe Ledda, François Gallaire, P. -T. Brun

摘要:

已知悬浮在湿基底的下侧上的悬垂液滴从周围的薄液膜积聚流体,该过程通常导致滴落。这种液滴的生长由于它们在均匀的水平膜上平移的能力而加速。在这里,我们表明,这种情况是令人惊讶的逆转时,基板稍微倾斜($\approx 2$度),液滴变得太快,在他们的运动过程中增长和收缩。结合实验和数值模拟,我们合理化的传统的增长制度和以前未知的衰变制度,我们报告之间的过渡。使用的朗道-列维奇弯月面,连接到膜的分析处理,我们定量预测的两个流态和临界倾角的值,它们之间的过渡发生的下降动态。

英文摘要:

Pendant drops suspended on the underside of a wet substrate are known to accumulate fluid from the surrounding thin liquid film, a process that often results in dripping. The growth of such drops is hastened by their ability to translate over an otherwise uniform horizontal film. Here we show that this scenario is surprisingly reversed when the substrate is slightly tilted ($\approx 2$ deg) ; drops become too fast to grow and shrink over the course of their motion. Combining experiments and numerical simulations, we rationalize the transition between the conventional growth regime and the previously unknown decay regime we report. Using an analytical treatment of the Landau-Levich meniscus that connects the drop to the film, we quantitatively predict the drop dynamics in the two flow regimes and the value of the critical inclination angle where the transition between them occurs.

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