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Coalescence preference in densely packed microbubbles.

Yeseul Kim1, Su Jin Lim1, Bopil Gim2

  • 1Soft Matter Physics Laboratory, School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.

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Summary
This summary is machine-generated.

Coalescence preference, where merging bubbles favor larger parents, is blocked in dense bubble clusters. This finding challenges existing theories and offers new insights into soft matter dynamics.

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Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Bubble coalescence typically shows a preference for merging with the larger parent bubble.
  • This phenomenon, known as coalescence preference, is driven by surface energy release.
  • Existing theories predict a specific relationship between coalescence position and parent size ratio.

Purpose of the Study:

  • To investigate whether coalescence preference can be altered or blocked in specific conditions.
  • To examine the dynamics of bubble coalescence within densely packed microbubble systems.
  • To compare experimental observations with theoretical predictions for coalescence behavior.

Main Methods:

  • Utilized high-speed, high-resolution X-ray microscopy for detailed visualization.
  • Studied individual coalescence events in microbubbles with a local packing fraction of approximately 40%.
  • Quantified the relative coalescence position and its relation to parent bubble size ratios.

Main Results:

  • Demonstrated that coalescence preference can be effectively blocked within densely packed microbubble clusters.
  • Observed a deviation from the surface energy release theory's prediction of an exponent of 5.
  • Found an exponent of 2 for the relationship between relative coalescence position and parent size ratio in dense packings.

Conclusions:

  • The coalescence preference is not a universal phenomenon and can be suppressed in crowded environments.
  • The observed exponent of 2 suggests a different underlying mechanism governing coalescence in dense soft matter.
  • These findings are crucial for understanding coalescence dynamics across diverse soft matter packing scenarios.