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This study reveals diverse microstreaming patterns around oscillating microbubbles using theoretical modeling and experimental validation. The fluid flow patterns depend significantly on the bubble

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Area of Science:

  • Fluid dynamics
  • Acoustic cavitation
  • Microscale phenomena

Background:

  • Microbubbles are widely used in various applications, including medical imaging and drug delivery.
  • Understanding the fluid flow patterns around oscillating microbubbles is crucial for optimizing these applications.
  • Previous studies have primarily focused on spherically symmetric oscillations, limiting the understanding of complex flow behaviors.

Purpose of the Study:

  • To investigate the theoretical and experimental aspects of axisymmetric flow surrounding non-spherically oscillating microbubbles.
  • To reveal the variety of microstreaming patterns generated by microbubble oscillations.
  • To establish the relationship between the bubble interface oscillation modes and the resulting fluid flow.

Main Methods:

  • Theoretical modeling using exact analytical solutions for second-order mean flows.
  • Analysis of microbubble interface oscillation modes (spherical, translational, nonspherical).
  • Experimental investigation of fluid flow induced by a single, non-spherically oscillating bubble in an unbounded fluid.

Main Results:

  • A wide variety of microstreaming patterns were identified through theoretical modeling.
  • The streaming patterns were found to be highly dependent on the modal content of the bubble interface oscillation.
  • Experimental results successfully validated the theoretical predictions for fluid flow induced by non-spherically oscillating microbubbles.

Conclusions:

  • Non-spherical oscillations of microbubbles generate complex and diverse microstreaming patterns.
  • The modal content of bubble oscillations is a key determinant of microstreaming behavior.
  • The study provides a comprehensive understanding of microbubble-induced fluid flow, with implications for various scientific and technological fields.