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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
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Off-equilibrium surface tension in colloidal suspensions.

Domenico Truzzolillo1, Serge Mora1, Christelle Dupas1

  • 1Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France and CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France.

Physical Review Letters
|April 15, 2014
PubMed
Summary
This summary is machine-generated.

The fingering instability in colloidal suspensions is driven by nonlinear viscosity and an effective surface tension. This effective surface tension scales with concentration squared, aligning with theoretical predictions for miscible fluids.

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Area of Science:

  • Fluid dynamics
  • Colloid science
  • Interface phenomena

Background:

  • Fingering instability occurs at the interface of miscible fluids.
  • Colloidal suspensions exhibit complex rheological properties.

Purpose of the Study:

  • Investigate the fingering instability in colloidal suspensions.
  • Determine the governing factors of interface evolution.
  • Analyze the role of effective surface tension and viscosity.

Main Methods:

  • Experiments using a Hele-Shaw cell.
  • Studying suspensions with varying volume fractions (ΦC).
  • Analyzing temporal interface evolution.

Main Results:

  • Interface evolution is governed by nonlinear viscosity and effective surface tension (Γe).
  • Effective surface tension scales with concentration squared (Γe∼ΦC2).
  • Surface tension increases anomalously with particle size.

Conclusions:

  • Korteweg's theory for miscible fluids accurately predicts the observed scaling of effective surface tension.
  • Entropy arguments explain the anomalous increase in surface tension with particle size.