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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Nonlinear Physics

Background:

  • Acoustic radiation pressure is vital for manipulating gas bubbles in various applications.
  • Existing models typically assume spherical bubbles with linear pulsations.
  • Applications like ultrasonic cleaning necessitate understanding aspherical bubble dynamics.

Purpose of the Study:

  • To derive methods for calculating acoustic radiation pressure variations on non-spherical bubbles.
  • To investigate the impact of nonlinear bubble oscillations on radiation force magnitude and direction.

Main Methods:

  • Theoretical derivation of radiation pressure calculations for aspherical bubble oscillations.
  • Analysis of the influence of oscillation amplitude (Vm) and phase relationship on radiation force.
  • Comparison of results with models based solely on linear pulsations.

Main Results:

  • Radiation force growth decelerates as oscillation amplitude (Vm) exceeds a linear threshold.
  • Inclusion of distortion modes shifts the frequency at which the radiation force changes direction (attractive/repulsive).
  • Non-spherical oscillations significantly alter the predicted radiation force compared to linear models.

Conclusions:

  • Non-spherical bubble dynamics are critical for accurate acoustic radiation pressure predictions.
  • The findings refine understanding of bubble manipulation and interaction in acoustic fields.
  • This work provides a more comprehensive theoretical framework for acoustic radiation forces on bubbles.