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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Dynamics of levitated objects in acoustic vortex fields.

Z Y Hong1, J F Yin2, W Zhai2

  • 1Department of Applied Physics, Northwestern Polytechnical University, Xi'an, 710072, China. hongzy@nwpu.edu.cn.

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|August 4, 2017
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Summary
This summary is machine-generated.

Acoustic vortex fields enable stable levitation of diverse objects using fewer sources. This novel acoustic levitation technique allows controllable droplet deformation and rapid object rotation.

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Area of Science:

  • Physics
  • Acoustics
  • Fluid Dynamics

Background:

  • Acoustic levitation facilitates contactless manipulation of materials in gaseous media.
  • Current methods for levitating high-density objects are limited to simple standing-wave fields.
  • Applications include chemical analysis, high-temperature processing, drop dynamics, and bioreactors.

Purpose of the Study:

  • To demonstrate a novel method for acoustic levitation using acoustic vortex fields.
  • To investigate the manipulation capabilities of acoustic vortices on levitated objects.
  • To expand the versatility and applications of acoustic levitation technology.

Main Methods:

  • Generating acoustic vortex fields using a small number of peripheral sound sources.
  • Levitating a wide range of liquid and solid objects within these fields.
  • Observing and analyzing the forces exerted by acoustic vortices on levitated water droplets.
  • Investigating orbital angular momentum transfer for object rotation control.

Main Results:

  • Stable levitation of diverse liquid and solid objects was achieved using acoustic vortex fields.
  • Acoustic vortex forces induced controllable deformation and axial oscillation in levitated water droplets.
  • Orbital angular momentum transfer was demonstrated, enabling rapid rotation of levitated objects.
  • The rotation rate was controllable via the amplitude of the sound sources.

Conclusions:

  • Acoustic vortex fields offer a versatile and efficient approach to acoustic levitation.
  • This method overcomes limitations of traditional standing-wave levitation for high-density objects.
  • The findings pave the way for new applications in contactless material processing and manipulation.