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Shape evolution and bubble formation of acoustically levitated drops

Di, Wenli; Zhang, Zehui; Li, Lin; Lin, Kejun; Li, Jun; Li, Xiaoguang; Binks, Bernard P; Chen, Xiaopeng; Zang, Duyang

Authors

Wenli Di

Zehui Zhang

Lin Li

Kejun Lin

Jun Li

Xiaoguang Li

Xiaopeng Chen

Duyang Zang

Abstract

In this study, we investigated the shape evolution and bubble formation of acoustically levitated drops upon increasing the sound intensity. Here, a levitated liquid drop evolves progressively from an oblate spheroidal shape to a flattened film to a thin bowl-shaped film, eventually forming a closed bubble. Through systematic experiments, numerical simulation, and scaling analysis, we demonstrate that the buckled geometry of the liquid film can drastically enhance the suction effect of acoustic radiation pressure at its rim, forming a significant pressure gradient inside the film which causes an abrupt area expansion and bubble formation. Our results provide the mechanical origin responsible for the shape evolution and bubble formation of acoustically levitated drops, and highlight the role of buckled geometry in the levitation and manipulation of liquid films in an ultrasound field.

Journal Article Type Article
Publication Date Oct 29, 2018
Journal Physical Review Fluids
Print ISSN 2469-990X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 3
Article Number 103606
Institution Citation Di, W., Zhang, Z., Li, L., Lin, K., Li, J., Li, X., …Zang, D. (2018). Shape evolution and bubble formation of acoustically levitated drops. Physical Review Fluids, 3, https://doi.org/10.1103/PhysRevFluids.3.103606
DOI https://doi.org/10.1103/PhysRevFluids.3.103606
Keywords Drops and bubbles; Rheology
Publisher URL https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.3.103606

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