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Related Experiment Videos

Spiraling bubbles: how acoustic and hydrodynamic forces compete.

J Rensen1, D Bosman, J Magnaudet

  • 1Department of Applied Physics, University of Twente, 7500 AE Enschede, The Netherlands.

Physical Review Letters
|June 1, 2001
PubMed
Summary

Acoustic forces cause bubbles in shear flows to spiral. A simple force-balance model accurately predicts this bubble dynamics, showing its relevance even with sound fields.

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Area of Science:

  • Fluid dynamics
  • Acoustics
  • Bubble dynamics

Background:

  • Understanding bubble behavior in fluid flows is crucial for various industrial and scientific applications.
  • Acoustic forces can significantly influence bubble motion, but their interplay with hydrodynamic forces in shear flows is complex.

Purpose of the Study:

  • To investigate the effect of acoustic forces on individual bubbles within shear flows.
  • To model and understand the resulting spiraling bubble trajectories.

Main Methods:

  • Experimental setup to observe individual bubbles in shear flows under acoustic influence.
  • Development of an ordinary differential equation model balancing acoustic (Bjerknes) and hydrodynamic forces.
  • Application of a separation of time scales to the model.

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Main Results:

  • Observed competition between acoustic and fluid dynamical forces leading to spiraling bubble trajectories.
  • The developed ordinary differential equation model successfully predicted the observed dynamics.
  • Demonstrated the validity of a simple force-balance approach for bubbles in sound fields.

Conclusions:

  • Acoustic forces induce complex, spiraling trajectories for bubbles in shear flows.
  • A simplified force-balance model, incorporating acoustic and hydrodynamic interactions, effectively captures this behavior.
  • The study validates the continued relevance of fundamental force-balance principles in acoustics-driven fluid dynamics.