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Bubble pulsation characteristics in multi-bubble systems affected by bubble size polydispersity and spatial

Qingqin Zou1, Xianhua Zhong1, Bingyu Zhang1

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Bubble size and arrangement significantly impact bubble pulsation dynamics in ultrasound applications. Understanding these factors optimizes microbubble behavior in viscoelastic tissues.

Keywords:
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Area of Science:

  • Acoustics
  • Biophysics
  • Fluid Dynamics

Background:

  • Microbubble behavior is crucial for ultrasound applications.
  • Interactions between multiple bubbles, especially with varying sizes, are complex.
  • The influence of bubble arrangement and size distribution on pulsation dynamics requires further investigation.

Purpose of the Study:

  • To investigate bubble pulsation characteristics in a multi-bubble environment.
  • To analyze the effects of bubble size polydispersity and two-dimensional structure on bubble pulsations.
  • To understand how acoustic pressure and tissue properties influence these dynamics.

Main Methods:

  • Simulated three interacting bubbles with controlled initial radii and inter-bubble distances.
  • Employed bifurcation analysis to study pulsation characteristics of a small bubble.
  • Varied acoustic pressure, bubble configurations, and tissue viscoelasticity.

Main Results:

  • Bubble size polydispersity and two-dimensional structure significantly affect pulsation amplitude and nonlinearity.
  • Two-dimensional structure effects are pronounced at small inter-bubble distances.
  • Bubble size polydispersity consistently impacts pulsations across all configurations.
  • Acoustic pressure, large bubble proximity, and increased large bubble radius enhance these effects.
  • Tissue viscoelasticity variations also increase the observed effects.

Conclusions:

  • Bubble size and arrangement are critical factors in multi-bubble dynamics.
  • Findings provide insights into microbubble behavior in ultrasound-excited viscoelastic tissues.
  • This research can aid in optimizing ultrasound-mediated applications involving microbubbles.