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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Acoustic radiation force analysis using finite difference time domain method.

A Grinenko1, P D Wilcox, C R P Courtney

  • 1Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom. a.greenenko@bristol.ac.uk

The Journal of the Acoustical Society of America
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel finite difference time domain Lagrangian method to analyze acoustic radiation force from standing waves on particles. The method accurately models particle interactions without assumptions, showing good agreement with existing models for compressible particles.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Computational Physics

Background:

  • Acoustic radiation force is crucial for particle manipulation and characterization.
  • Existing models often rely on simplifying assumptions regarding particle size, geometry, and acoustic field properties.
  • A direct method for calculating acoustic radiation force is needed to overcome these limitations.

Purpose of the Study:

  • To develop and validate a novel computational method for analyzing acoustic radiation force exerted by standing waves on particles.
  • To directly compute acoustic radiation force from nonlinear fluid equations without prior assumptions.
  • To assess the method's accuracy and convergence compared to established analytical and numerical models.

Main Methods:

  • Implementation of a finite difference time domain Lagrangian method.
  • Directly solving nonlinear fluid equations to obtain acoustic radiation force.
  • Analysis of particle behavior under acoustic standing waves.

Main Results:

  • The finite difference time domain Lagrangian method directly calculates acoustic radiation force.
  • The model shows convergence to analytical results for small particles and low acoustic field amplitudes.
  • Good agreement was observed with analytical and numerical models for compressible particles.
  • Discrepancies were noted for particles with lower compressibility.

Conclusions:

  • The developed finite difference time domain Lagrangian method offers a robust approach for analyzing acoustic radiation force.
  • The method's validity is confirmed for compressible particles, providing a valuable tool for acoustic manipulation research.
  • Further investigation is warranted for less compressible particles to refine the model's applicability.