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Energy Dissipation during Wenzel Wetting via Roughness Scale Interface Dynamics.

Pawan Kumar1, Dalton J E Harvie1

  • 1Multiphysics Fluid Dynamics Group, Department of Chemical Engineering, The University of Melbourne, Parkville, 3010 Victoria, Australia.

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|July 25, 2024
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Summary
This summary is machine-generated.

A new numerical method simulates fluid interface movement over rough surfaces, predicting static contact angle hysteresis (CAH) by calculating energy dissipation. This approach accurately models real interface motion and aids in surface design.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Computational physics

Background:

  • Simulating fluid interfaces on rough surfaces is crucial for understanding phenomena like wetting and adhesion.
  • Existing models often struggle to accurately capture the complex dynamics at the roughness scale.

Purpose of the Study:

  • To develop and validate a numerical method for simulating fluid interface dynamics over chemically homogeneous rough surfaces.
  • To predict static contact angle hysteresis (CAH) using energy dissipation calculations derived from surface topography.

Main Methods:

  • Governing augmented Navier-Stokes and Young's boundary condition equations were analyzed.
  • A mechanical energy balance framework was combined with simulations of interfacial morphologies.
  • Energy dissipation was calculated for a surface with periodic pillars.

Main Results:

  • The numerical method accurately represents local interface behavior through equilibrium interfacial morphologies.
  • Energy dissipation was found to vary with the area fraction (ϕ) as approximately ϕln(ϕ).
  • Predicted CAH showed good agreement with experimental data, validating the simulation's accuracy.

Conclusions:

  • The proposed numerical method effectively captures real interface motion and predicts CAH.
  • The study demonstrates consistency between far-field contact angle and energy dissipation approaches.
  • This work enables quantitative analysis and design for applications involving fluid interfaces on rough surfaces.