文章基本信息

标题：Shrinking instability of toroidal droplets
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作者：Alexandros A. Fragkopoulos ; Ekapop Pairam ; Eric Berger 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2017
卷号：114
期号：11
页码：2871-2875
DOI：10.1073/pnas.1619073114
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Toroidal droplets are inherently unstable due to surface tension. They can break up, similar to cylindrical jets, but also exhibit a shrinking instability, which is inherent to the toroidal shape. We investigate the evolution of shrinking toroidal droplets using particle image velocimetry. We obtain the flow field inside the droplets and show that as the torus evolves, its cross-section significantly deviates from circular. We then use the experimentally obtained velocities at the torus interface to theoretically reconstruct the internal flow field. Our calculation correctly describes the experimental results and elucidates the role of those modes that, among the many possible ones, are required to capture all of the relevant experimental features.
关键词：liquid tori ; PIV ; hydrodynamic instabilities ; Stokes flow ; stream function