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Vortex-ring-induced large bubble entrainment during drop impact.

Marie-Jean Thoraval1,2,3, Yangfan Li4, Sigurdur T Thoroddsen1

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This summary is machine-generated.

Drop impacts can create large air bubbles, crucial for aerosol formation. Weaker vortex rings, not the strongest, control bubble entrapment by deforming impact craters, explaining bubble formation in prolate drop impacts.

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Area of Science:

  • Fluid dynamics
  • Interface phenomena
  • Aerosol science

Background:

  • Drop impacts on liquid surfaces can entrap air bubbles.
  • These bubbles are significant for aerosol formation and gas transport.
  • Large bubble entrapment is linked to prolate drop shapes at impact.

Purpose of the Study:

  • Investigate the mechanism of large air bubble entrapment during drop impacts.
  • Identify the role of vortex rings in crater deformation and bubble pinch-off.
  • Explain the influence of drop shape (prolate vs. oblate) on bubble formation.

Main Methods:

  • Experimental drop impact studies.
  • Numerical simulations of fluid dynamics.
  • Analysis of vortex ring dynamics and crater evolution.

Main Results:

  • A concentrated vortex ring in the impact neck controls crater deformation and pinch-off.
  • Weaker vortex rings, not the strongest, are responsible for entrapping large bubbles.
  • Strong vortex rings self-destruct, while weaker ones deform craters sufficiently for pinch-off.
  • Prolate drop shapes produce weaker, more effective vortex rings for large bubble formation.

Conclusions:

  • Vortex ring strength is critical in determining large bubble entrapment during drop impacts.
  • The findings clarify the physics behind bubble formation at the air-sea interface.
  • This research has implications for understanding aerosol generation and gas exchange processes.