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Related Experiment Videos

Surfactant Scavenging and Surface Deposition by Rising Bubbles.

Stefan1, Szeri

  • 1Department of Mechanical and Aerospace Engineering, University of California-Irvine, Irvine, California, 92697-3975

Journal of Colloid and Interface Science
|March 11, 1999
PubMed
Summary

Rising bubbles scavenge surfactants, immobilizing their surface and affecting rise speed. Bubble-induced mixing is crucial for predicting surfactant enrichment on the bulk surface.

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Area of Science:

  • Fluid dynamics
  • Surface chemistry
  • Colloid science

Background:

  • Bubbles rising in liquids scavenge dissolved surfactants.
  • Surfactant-coated bubbles exhibit altered surface mobility, affecting drag and rise speed.
  • A cloud of rising bubbles significantly enriches the bulk surface with surfactants.

Purpose of the Study:

  • To develop a model for surfactant uptake by bubbles and deposition on the bulk surface.
  • To incorporate the effect of bubble-induced fluid mixing into the surfactant deposition model.
  • To identify key factors influencing surfactant enrichment on the bulk surface.

Main Methods:

  • Development of a mathematical model for surfactant-bubble interactions.
  • Inclusion of bubble-induced fluid mixing as a critical parameter.

Related Experiment Videos

  • Analysis of surfactant desorption and transport within the bulk fluid.

    • Main Results:

    • Bubble surface immobilization due to surfactant adsorption affects bubble dynamics.
    • Bubble clouds lead to substantial surfactant enrichment on the bulk surface.
    • Fluid mixing induced by bubble motion is essential for accurate prediction of surface enrichment.

    Conclusions:

    • The model highlights the interplay between bubble scavenging, surface deposition, and fluid mixing.
    • Mixing of desorbed surfactant into the bulk liquid is a critical factor in determining surface enrichment.
    • Understanding these processes is vital for applications involving bubble-laden fluids.