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Related Experiment Videos

Kinetic Effects in Dynamic Wetting.

James E Sprittles1

  • 1Mathematics Institute, University of Warwick, Coventry CV4 7AL, United Kingdom.

Physical Review Letters
|April 4, 2017
PubMed
Summary

Understanding liquid wetting dynamics requires considering gas lubrication effects. This study models kinetic gas effects to predict maximum wetting speeds, accounting for viscosity and pressure variations.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Kinetic theory

Background:

  • Liquid wetting of solids is limited by gas lubrication films at the contact line.
  • Hydrodynamic models are insufficient due to film heights near the gas mean free path.

Purpose of the Study:

  • To develop a model incorporating kinetic gas effects for wetting dynamics.
  • To predict maximum wetting speeds based on liquid viscosity and gas pressure.

Main Methods:

  • Utilizing the Boltzmann equation to model kinetic gas effects.
  • Developing a theoretical model for gas lubrication film displacement.

Main Results:

  • The model predicts increased maximum wetting speeds with varied liquid viscosity.
  • Reduced ambient gas pressure also leads to higher maximum wetting speeds.

Conclusions:

  • Kinetic gas effects are crucial for accurately modeling high-speed wetting phenomena.
  • The developed model successfully explains experimental observations of wetting speed limitations.

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