A new wrinkle on liquid sheets: Turning the mechanism of viscous bubble collapse upside down
A new wrinkle on liquid sheets: Turning the mechanism of viscous bubble collapse upside down
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DOI：
10.1126/science.aba0593
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发表时间：
2020-08-07
期刊：
影响因子：
56.9
通讯作者：
Bird, James C.
中科院分区：
文献类型：
--
作者：
Oratis, Alexandros T.;Bush, John W. M.;Bird, James C.
粘性气泡在自然环境和工业环境中都很普遍。它们的破裂和塌陷可能伴随着通常与弹性片相关的特征，包括径向褶皱的发展。以前的研究人员得出的结论是，薄膜重量是负责的薄膜崩溃和不稳定性。相反，我们在这里的实验表明，重力起着微不足道的作用：同样的崩溃和扭曲出现独立的气泡的方向。我们发现，表面张力驱动的崩溃，并启动动态屈曲不稳定性。由于膜的重量是无关紧要的，我们的研究结果表明，同样可以伴随着相对小规模的，弯曲的粘性和粘弹性膜，包括那些在呼吸道负责从呼气事件产生的气溶胶的分裂。
Viscous bubbles are prevalent in both natural and industrial settings. Their rupture and collapse may be accompanied by features typically associated with elastic sheets, including the development of radial wrinkles. Previous investigators concluded that the film weight is responsible for both the film collapse and wrinkling instability. Conversely, we show here experimentally that gravity plays a negligible role: The same collapse and wrinkling arise independently of the bubble's orientation. We found that surface tension drives the collapse and initiates a dynamic buckling instability. Because the film weight is irrelevant, our results suggest that wrinkling may likewise accompany the breakup of relatively small-scale, curved viscous and viscoelastic films, including those in the respiratory tract responsible for aerosol production from exhalation events.