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Related Experiment Videos

Air bubbles under vertical vibrations.

F Zoueshtiagh1, H Caps, M Legendre

  • 1LML, Université de Lille 1, UMR 8107 CNRS, Bd Paul Langevin, F-59655, Villeneuve d'Ascq, France. Farzam.Zoueshtiagh@univ-lille1.fr

The European Physical Journal. E, Soft Matter
|July 29, 2006
PubMed
Summary
This summary is machine-generated.

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Vertical oscillations can cause air bubbles to split. Bubble splitting instability depends on acceleration, viscosity, surface tension, and initial size, with a clear acceleration threshold observed.

Area of Science:

  • Fluid dynamics
  • Instability phenomena
  • Bubble dynamics

Background:

  • Understanding bubble behavior under external forces is crucial in various industrial and scientific applications.
  • The splitting instability of bubbles can significantly alter multiphase flow characteristics.

Purpose of the Study:

  • To experimentally investigate the splitting instability of an air bubble in a liquid under vertical oscillations.
  • To determine the relationship between bubble dynamics and oscillation acceleration.
  • To identify the physical parameters influencing bubble division.

Main Methods:

  • An experimental setup using a sealed cylindrical cell filled with liquid and a few-centimeter air bubble.
  • Observation of bubble response to vertical oscillations using high-speed video.

Related Experiment Videos

  • Systematic variation of oscillation acceleration and measurement of bubble behavior.

    • Main Results:

    • Bubble dynamics are strongly correlated with the cell's acceleration (Gamma).
    • Increasing acceleration leads to amplified shape deformations, potentially forming a toroidal bubble.
    • A critical acceleration threshold was identified for bubble splitting, dependent on fluid viscosity, surface tension, and initial bubble size.
    • The number of bubbles increases above the threshold, reaching a steady state characterized by the Bond number.

    Conclusions:

    • Bubble splitting instability is triggered by exceeding a specific oscillation acceleration threshold.
    • Fluid properties and initial bubble size influence the splitting phenomenon.
    • The final bubble size distribution can be predicted using the Bond number.