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Related Experiment Videos

Dynamical transition induced by large bubbles in two-dimensional foam flows.

I Cantat1, R Delannay

  • 1GMCM, UMR 6626, Université de Rennes (CNRS), 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. isabelle.cantat@univ-rennes1.fr

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2003
PubMed
Summary

Large bubbles in flowing foam become unstable at critical speeds, migrating faster than the foam. This size segregation, driven by viscous forces, can destabilize foam flow and impact transport.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Ordered two-dimensional foams exhibit complex behaviors under flow.
  • Understanding bubble dynamics is crucial for predicting foam transport properties.

Purpose of the Study:

  • To investigate the dynamical behavior of large bubbles in 2D foam plug flow.
  • To determine the conditions and mechanisms for bubble migration and size segregation.

Main Methods:

  • Analytical modeling of foam flow dynamics.
  • Numerical simulations to predict bubble behavior.
  • Analysis of pressure fields and velocity thresholds.

Main Results:

  • A critical velocity was identified above which large bubbles migrate faster than the mean flow.

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  • Viscous effects were determined to be the primary driver of this size segregation.
  • Analytical and numerical predictions for pressure, velocity threshold, and relative bubble velocity were developed.

    • Conclusions:

    • Large bubble migration in 2D foam flow is a velocity-dependent phenomenon.
    • This size segregation can lead to flow destabilization and significantly alter foam transport.
    • The findings provide insights into the rheology and transport in structured foams.