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Acoustic streaming generated by two orthogonal standing waves propagating between two rigid walls.
Alexander A Doinikov1, Pierre Thibault1, Philippe Marmottant1
1Laboratoire Interdisciplinaire de Physique, Unités Mixtes de Recherche 5588, Centre National de la Recherche Scientifique, Université Grenoble-Alpes, Grenoble, F-38401, France.
The Journal of the Acoustical Society of America
|March 4, 2017
Summary
Acoustic streaming in confined fluids generates rotating vortices. The phase shift between orthogonal standing waves dictates vortex characteristics like location, form, and strength.
Area of Science:
- Fluid dynamics
- Acoustics
- Acoustic streaming
Background:
- Acoustic streaming is a phenomenon driven by acoustic waves.
- Understanding fluid behavior under acoustic influence is crucial in microfluidics and acoustics research.
Purpose of the Study:
- To derive an analytical solution for acoustic streaming.
- To investigate the vortex formation and characteristics generated by orthogonal standing waves.
Main Methods:
- Analytical solution derivation.
- Analysis of fluid behavior within boundary layers smaller than acoustic wavelengths.
Main Results:
- Acoustic streaming creates vortices with fluid particles rotating about axes perpendicular to confining walls.
- Vortex properties such as location, shape, rotation direction, and strength are controlled by the phase shift between the driving waves.
Conclusions:
- The study provides an analytical framework for understanding acoustic streaming patterns.
- Phase shift is a key parameter for controlling acoustic streaming-induced vortices in confined fluids.
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