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A new wrinkle on liquid sheets: Turning the mechanism of viscous bubble collapse upside down
Science ( IF 56.9 ) Pub Date : 2020-08-06 , DOI: 10.1126/science.aba0593
Alexandros T Oratis 1 , John W M Bush 2 , Howard A Stone 3 , James C Bird 1
Affiliation  

Slower-motion bubble collapse The collapse of viscous bubbles is of practical interest to geophysics, glass manufacturing, and food processing. Previous studies have suggested that gravity or small punctures may play a role in the wrinkling and collapse of viscous bubbles. By studying bubbles with a range of viscosity and by tilting them both sideways and upside down, Oratis et al. conclude that gravity is not a factor. Instead, surface tension and dynamic stress of the compressed liquid seem to be the main driving mechanisms for the behavior of the bubbles and the wrinkling instability. Science, this issue p. 685 Rather than gravity, surface tension and dynamic stress drive viscous liquid bubble wrinkling and collapse. 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.

中文翻译:

液体片上的新皱纹:将粘性气泡崩溃的机制颠倒过来

慢速气泡坍塌 粘性气泡的坍塌对地球物理学、玻璃制造和食品加工具有实际意义。先前的研究表明,重力或小刺孔可能在粘性气泡的起皱和破裂中起作用。Oratis 等人通过研究具有一定粘度范围的气泡并将它们向侧面和倒置倾斜。得出重力不是一个因素的结论。相反,压缩液体的表面张力和动态应力似乎是气泡行为和起皱不稳定性的主要驱动机制。科学,这个问题 p。685 不是重力,表面张力和动态应力驱动粘性液体气泡起皱和破裂。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,包括径向皱纹的发展。先前的研究人员得出结论,薄膜的重量是薄膜塌陷和起皱不稳定的原因。相反,我们在这里通过实验证明重力的作用可以忽略不计:同样的坍塌和起皱的产生与气泡的方向无关。我们发现表面张力会导致坍塌并引发动态屈曲不稳定性。由于薄膜重量无关紧要,我们的结果表明,起皱可能同样伴随着规模相对较小的弯曲粘性和粘弹性薄膜的破裂,包括呼吸道中负责呼气事件产生气溶胶的薄膜。包括径向皱纹的发展。先前的研究人员得出结论,薄膜的重量是薄膜塌陷和起皱不稳定的原因。相反,我们在这里通过实验证明重力的作用可以忽略不计:同样的坍塌和起皱的产生与气泡的方向无关。我们发现表面张力会导致坍塌并引发动态屈曲不稳定性。由于薄膜重量无关紧要,我们的结果表明,起皱可能同样伴随着规模相对较小的弯曲粘性和粘弹性薄膜的破裂,包括呼吸道中负责呼气事件产生气溶胶的薄膜。包括径向皱纹的发展。先前的研究人员得出结论,薄膜的重量是薄膜塌陷和起皱不稳定的原因。相反,我们在这里通过实验证明重力的作用可以忽略不计:同样的坍塌和起皱的产生与气泡的方向无关。我们发现表面张力会导致坍塌并引发动态屈曲不稳定性。由于薄膜重量无关紧要,因此我们的结果表明,起皱可能同样伴随着规模相对较小的弯曲粘性和粘弹性薄膜的破裂,包括呼吸道中负责呼气事件产生气溶胶的薄膜。我们在这里通过实验证明重力的作用可以忽略不计:同样的坍塌和起皱的产生与气泡的方向无关。我们发现表面张力会导致坍塌并引发动态屈曲不稳定性。由于薄膜重量无关紧要,我们的结果表明,起皱可能同样伴随着规模相对较小的弯曲粘性和粘弹性薄膜的破裂,包括呼吸道中负责呼气事件产生气溶胶的薄膜。我们在这里通过实验证明重力的作用可以忽略不计:同样的坍塌和起皱的产生与气泡的方向无关。我们发现表面张力会导致坍塌并引发动态屈曲不稳定性。由于薄膜重量无关紧要,我们的结果表明,起皱可能同样伴随着规模相对较小的弯曲粘性和粘弹性薄膜的破裂,包括呼吸道中负责呼气事件产生气溶胶的薄膜。
更新日期:2020-08-06
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