论文标题
在掉落的火山口倒塌过程中，众多的奇异喷气机
Multitude of singular jets during the collapse of drop-impact craters
论文作者
论文摘要
当滴剂和池具有不同的不混溶液体时，我们从掉落的陨石坑的崩溃中研究了奇异的喷气机。当没有气泡被捏合时，这些喷气机从篮板窗口底部的酒窝浮出水面。参数空间比相同的液体要复杂得多，这揭示了复杂的化合物粉末形状。与通用的毛细管惯性下降滴度相反，捏合颈部半径为$ r \ sim t^{2/3} $，纯粹的惯性空气 - 二人具有$ r \ sim t^{1/2} $，并且对初始和边界条件很敏感。因此，毛细管波可以将凹痕塑造成不同的塌陷形状，其标准化喷射速度比爆裂气泡的喷气机大的数量级要大。我们研究了两个幂律之间的跨界。最快的喷气机可以从射流底部的尖齿中捏合环形微气泡。
We study singular jets from the collapse of drop-impact craters, when the drop and pool are of different immiscible liquids. These jets emerge from a dimple at the bottom of the rebounding crater, when no bubble is pinched off. The parameter space is considerably more complex than for identical liquids, revealing intricate compound-dimple shapes. In contrast to the universal capillary-inertial drop-regime, where the pinch-off neck radius scales as $R\sim t^{2/3}$, a purely inertial air-dimple has $R \sim t^{1/2}$ and is sensitive to initial and boundary conditions. Capillary waves can therefore mold the dimple into different collapse shapes, with normalized jetting speeds one order of magnitude larger than for jets from bursting bubbles. We study the cross-over between the two power-laws. The fastest jets can pinch off a toroidal micro-bubble from the cusp at the base of the jet.
