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Related Experiment Videos

Hydrodynamic interaction between spheres coated with deformable thin liquid films.

Seung-Man Yang1, L Gary Leal, Young-Seok Kim

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Taejon, 305-701, Korea. smyang@mail.kaist.ac.kr

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
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This study models hydrodynamic interactions during the coalescence of two unequal spheres coated in liquid. It reveals how liquid film shapes and drainage dynamics influence whether the films rupture or coalesce.

Area of Science:

  • Fluid dynamics
  • Interfacial phenomena
  • Colloid science

Background:

  • Drop coalescence is crucial in various industrial processes.
  • The film drainage mechanism, driven by hydrodynamic forces, governs droplet interaction.
  • Understanding coated sphere interactions is key to predicting coalescence outcomes.

Purpose of the Study:

  • To investigate the hydrodynamic interaction between two unequal spheres coated with thin deformable liquids.
  • To analyze the film drainage mechanism during the approach of these coated spheres.
  • To determine how parameters like viscosity ratio and capillary number affect coalescence.

Main Methods:

  • Developed a general formulation for head-to-head collision of unequal coated spheres.
  • Numerically solved evolution equations for deforming film shapes and stress distributions.

Related Experiment Videos

  • Analyzed hydrodynamic forces and film shapes as functions of separation distance and film thickness.

    • Main Results:

    • Observed film flattening and dimple formation with negative curvature at high lubrication pressure.
    • Found that increased capillary numbers accelerate dimple formation and film rupture.
    • Demonstrated that low capillary numbers lead to gap liquid drainage and eventual film coalescence.

    Conclusions:

    • Hydrodynamic interactions and film drainage dynamics dictate the outcome of coated sphere collisions.
    • Capillary number is a critical parameter controlling film rupture versus coalescence.
    • The study provides insights into the physics of drop coalescence in complex fluid systems.