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Suppression of Acoustic Streaming in Shape-Optimized Channels
1Department of Physics, Technical University of Denmark, DTU Physics Building 309, DK-2800 Kongens Lyngby, Denmark.
Physical Review Letters
|June 13, 2020
Summary
Acoustic streaming in fluids can be significantly reduced by optimizing wall shapes. This allows for enhanced particle manipulation without affecting acoustic pressure or radiation forces.
Area of Science:
- Fluid dynamics
- Acoustics
- Nonlinear dynamics
Background:
- Acoustic streaming is a common fluid motion caused by nonlinear acoustic waves.
- This phenomenon can interfere with precise particle manipulation using sound waves.
Purpose of the Study:
- To theoretically investigate methods for suppressing acoustic streaming.
- To explore the impact of optimized cavity shapes on acoustic streaming and related forces.
Main Methods:
- Theoretical analysis of fluid dynamics in oscillating systems.
- Computational modeling of acoustic wave propagation and nonlinear effects.
- Shape optimization of confining walls for fluid cavities.
Main Results:
- Acoustic streaming can be suppressed by two orders of magnitude through optimized wall geometry.
- Acoustic pressure and radiation forces on particles remain largely unaffected.
- Suppression is significant in major fluid regions within the optimized cavity.
Conclusions:
- Optimized cavity shapes offer a novel method to control acoustic streaming.
- This technique preserves essential acoustic forces for applications like particle handling.
- Potential for improved acoustophoretic manipulation of nanoparticles is demonstrated.
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