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Combining hydrodynamics and molecular kinetics to predict dewetting between a small bubble and a solid surface.

Chi M Phan1, Anh V Nguyen, Geoffrey M Evans

  • 1Discipline of Chemical Engineering, The University of Newcastle, University Drive, Callaghan, NSW 2308, Australia.

Journal of Colloid and Interface Science
|October 22, 2005
PubMed
Summary
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This study models air bubble dewetting from surfaces using hydrodynamics and molecular kinetics. The new model accurately predicts moving contact line velocity without needing generic theories or fitting parameters.

Area of Science:

  • Fluid dynamics
  • Surface science
  • Physical chemistry

Background:

  • Dewetting phenomena are crucial in various applications.
  • Existing hydrodynamic theories for moving contact lines have limitations.
  • Understanding bubble-surface interactions requires advanced modeling.

Purpose of the Study:

  • To develop a novel model for air bubble dewetting from solid surfaces in deionized water.
  • To predict the velocity of the moving contact line accurately.
  • To integrate hydrodynamic and molecular kinetic approaches for enhanced accuracy.

Main Methods:

  • Utilized hydrodynamics with an absolute coordinate system for dewetting.
  • Incorporated surface molecular kinetics to model the microscopic contact angle.

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  • Developed a combined model that overcomes limitations of generic hydrodynamic theories.

    • Main Results:

    • The model accurately predicts moving contact line velocity as a function of dynamic macroscopic contact angle.
    • The model provides corrections beyond generic hydrodynamic theories and eliminates the need for a macroscopic length scale.
    • The microscopic contact angle is a function of velocity and molecular properties, not a fitting parameter.
    • The model yields physically consistent values for slip length, molecular jumping distance, and frequency.
    • Experimental data validated the combined model's predictions.

    Conclusions:

    • The integrated hydrodynamic and molecular kinetic model offers superior accuracy for dewetting phenomena.
    • The model provides a more fundamental understanding of contact line dynamics.
    • Dissolved gases at the interface may impact slip length, warranting further investigation.