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Related Experiment Videos

Transient unidirectional acoustic streaming in annular resonators.

Mohamed Amari1, Vitalyi Gusev, Nicolas Joly

  • 1Laboratoire d'Acoustique de l'Université du Maine, UMR CNRS 6613, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France. mohamed.amari@univ-lemans.fr

Ultrasonics
|March 30, 2004
PubMed
Summary

This study develops a theory for acoustic streaming in toroidal waveguides, focusing on unidirectional flow excitation. Results show non-monotonous velocity evolution and highlight factors influencing stabilization time for applications in thermoacoustics and microfluidics.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Acoustics

Background:

  • Acoustic streaming is a phenomenon where sound waves generate fluid flow.
  • Toroidal waveguides and annular resonators are relevant geometries for various physical systems.
  • Understanding fluid pumping mechanisms is crucial for microfluidic applications.

Purpose of the Study:

  • To theoretically describe the transient excitation of acoustic streaming in a toroidal waveguide with driven walls.
  • To analyze the excitation of closed-loop, unidirectional streaming using a purely propagating acoustic mode.
  • To investigate the influence of geometric parameters on the streaming stabilization time.

Main Methods:

  • Development of a theoretical framework for acoustic streaming excitation.

Related Experiment Videos

  • Analysis of unidirectional streaming driven by a propagating acoustic mode.
  • Numerical evaluation of analytical solutions.

    • Main Results:

    • Demonstration of non-monotonous evolution of local streaming velocity.
    • Identification of the ratio of acoustic boundary layer thickness to waveguide width as a key factor for stabilization time.
    • Analytical solutions for acoustic streaming in an annular resonator.

    Conclusions:

    • The theoretical model provides insights into acoustic streaming dynamics in toroidal waveguides.
    • Findings are applicable to annular thermoacoustic engines and refrigerators.
    • Results offer potential for microfluidic fluid pumping mechanisms.