论文标题
太快了：吊坠的动力在薄膜上滑动
Too fast to grow: Dynamics of pendant drops sliding on a thin film
论文作者
论文摘要
已知悬浮在湿基质底部的吊坠滴剂会从周围的薄液膜中积聚流体，这一过程通常会导致滴落。这种滴剂的生长因其在原本均匀的水平膜上翻译的能力而加速。在这里，我们表明，当基板略微倾斜时，这种情况会出奇地逆转（$ \ \ \ 2 $ dg）；在运动过程中，下降变得太快而无法生长和收缩。结合了实验和数值模拟，我们合理化了传统的生长体制与以前未知的衰减状态之间的过渡。使用将滴剂连接到膜的Landau-Leandemeniscus的分析处理，我们可以定量预测两个流程度中的下降动力学以及它们之间发生过渡的临界倾斜角的值。
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.
