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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Vortex-mediated bouncing drops on an oscillating liquid.

Hong-Yu Chu1, Hsiang-Ting Fei1

  • 1Department of Physics, National Chung Cheng University, ChiaYi 62102, Taiwan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 15, 2014
PubMed
Summary
This summary is machine-generated.

Bouncing drops avoid merging with oscillating liquid surfaces, instead traveling along them. This phenomenon is driven by vortex pairs generated by the liquid

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Area of Science:

  • Fluid Dynamics
  • Soft Matter Physics
  • Surface Science

Background:

  • Understanding drop behavior on liquid surfaces is crucial in various scientific and industrial applications.
  • Previous studies have explored drop impact and coalescence, but the dynamics of bouncing drops on oscillating surfaces remain less understood.

Purpose of the Study:

  • To investigate the behavior of bouncing drops on an oscillating liquid surface.
  • To analyze the role of induced vortices in mediating drop-surface interactions and stable distances.

Main Methods:

  • Utilized particle image velocimetry (PIV) analysis to study drop dynamics.
  • Employed a quasi-one-dimensional setup to observe drop behavior and measure time-averaged flow fields.
  • Investigated drop interactions and induced vortex structures in both 1D and 3D (square cell) configurations.

Main Results:

  • Drops were observed to bounce and travel along the liquid surface without coalescing when surface oscillations were sufficiently strong.
  • Streaming vortex pairs were identified beneath bouncing drops, induced by the oscillating liquid surface.
  • Three stable drop distances, related to the Faraday wavelength, were identified in the quasi-one-dimensional setup.
  • A three-dimensional vortex ring was induced by a bouncing drop in a square cell.

Conclusions:

  • The study elucidates the non-coalescing bouncing behavior of drops on oscillating liquid surfaces.
  • Vortex dynamics play a critical role in mediating drop locomotion and establishing stable configurations.
  • The findings provide insights into vortex-mediated interactions and the formation of vortex structures in such systems.