Soap Films Burst Like Flapping Flags
Soap Films Burst Like Flapping Flags
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DOI：
10.1103/physrevlett.103.054501
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发表时间：
2009-07-31
影响因子：
8.6
通讯作者：
Villermaux, Emmanuel
中科院分区：
文献类型：
--
作者：
Lhuissier, Henri;Villermaux, Emmanuel
当被刺穿时，扁平的肥皂膜在液体表面张力的驱动下打开一个洞而爆裂。然而，孔的边缘并没有保持光滑，而是很快在韧带形成的尖端形成凹痕，最终破裂，使最初的连接膜变成一团脱节的水滴。我们报告了原始观测结果，表明这些凹痕是由薄膜和周围大气之间的旗子状不稳定性引起的，这种不稳定性引起了薄膜平面外的振荡运动。就像旗子的边缘在风中拍打一样，薄膜在垂直于其平面的两侧连续加速，引起薄膜厚度的调制和液体韧带的离心，最终挤压脱落，形成了我们观察到的喷雾。这种效应说明了脆弱物体（如薄液体薄膜）的动力学对其嵌入介质是多么敏感。
When punctured, a flat soap film bursts by opening a hole driven by liquid surface tension. The hole rim does not, however, remain smooth but soon develops indentations at the tip of which ligaments form, ultimately breaking and leaving the initially connex film into a mist of disjointed drops. We report on original observations showing that these indentations result from a flaglike instability between the film and the surrounding atmosphere inducing an oscillatory motion out of its plane. Just like a flag edge flaps in the wind, the film is successively accelerated on both sides perpendicularly to its plane, inducing film thickness modulations and centrifuging liquid ligaments that finally pinch off to form the observed spray. This effect exemplifies how the dynamics of fragile objects such as thin liquid films is sensitive to their embedding medium.