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Related Experiment Videos

Multibody dynamics in acoustophoresis.

Thierry Baasch1, Ivo Leibacher1, Jürg Dual1

  • 1Institute for Mechanical Systems, ETH Zurich, 8092 Zurich, Switzerland.

The Journal of the Acoustical Society of America
|April 5, 2017
PubMed
Summary
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This study introduces a new algorithm for simulating multiple interacting particles in acoustophoresis, accurately modeling particle collisions. The method enables precise computation of particle trajectories for improved acoustic manipulation and self-assembly applications.

Area of Science:

  • Physics
  • Fluid Dynamics
  • Acoustics

Background:

  • Numerical acoustophoresis faces challenges in simulating multiple interacting and colliding particles.
  • Previous research lacked rigorous modeling of particle-particle contacts in acoustic force calculations.

Purpose of the Study:

  • To develop and present a novel algorithm for computing complete particle trajectories in multi-particle acoustophoresis.
  • To rigorously model hard particle contacts and acoustic/hydrodynamic interactions.

Main Methods:

  • A semi-analytical method for acoustic forces (up to dipole contributions).
  • Stokes' flow resistance and mobility functions for hydrodynamic interactions.
  • A displacement-level algorithm using set-valued force laws for hard contacts.

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Main Results:

  • The algorithm allows computation of approximate complete trajectories for interacting particles.
  • Numerical simulations show good agreement with experimental observations of particle stacking.
  • Demonstrated simulation of particle clump rotation in orthogonal acoustic waves.

Conclusions:

  • The presented method offers a first approximation of complete trajectories for multiple interacting particles.
  • This work advances numerical acoustophoresis by rigorously modeling particle contacts.
  • The method provides new insights into self-assembly and acoustic particle manipulation.