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Dynamics of nonspherical microbubble oscillations above instability threshold.

Matthieu Guédra1, Sarah Cleve2, Cyril Mauger2

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This study uses high-speed imaging to analyze nonspherical bubble oscillations. Results reveal nonlinear effects like mode coupling and instability saturation, providing insights into bubble dynamics.

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Area of Science:

  • Fluid Dynamics
  • Acoustics
  • Nonlinear Dynamics

Background:

  • Understanding bubble dynamics is crucial in various scientific and industrial applications.
  • Previous studies often lacked certainty in bubble shape axisymmetry during oscillations.
  • Nonlinear effects and mode coupling in bubble oscillations require further experimental validation.

Purpose of the Study:

  • To experimentally capture and analyze the time-resolved dynamics of nonspherical bubble oscillations.
  • To ensure bubble shape axisymmetry with high certainty using multi-camera synchronization.
  • To compare experimental findings with theoretical models of nonlinear bubble dynamics.

Main Methods:

  • Utilizing high-speed imaging with two synchronous cameras positioned at 90 degrees.
  • Ensuring bubble shape axisymmetry through synchronized multi-angle imaging.
  • Analyzing temporal dynamics of finite-amplitude oscillations under varying acoustic pressures.

Main Results:

  • Confirmed axisymmetry of micrometer-sized bubble oscillations for the first time.
  • Observed nonlinear phenomena including instability saturation and triggering of nonparametric shape modes.
  • Quantified the amplitude of nonspherical oscillations (quadrupolar and octupolar) as a function of driving pressure.

Conclusions:

  • Experimental results align with and validate recent theories on nonlinear bubble dynamics and mode coupling.
  • The study provides a detailed characterization of bubble shape instabilities and their dependence on acoustic forcing.
  • This work offers a robust experimental basis for future investigations into complex bubble behavior.