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Is contact-line mobility a material parameter?

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Summary
This summary is machine-generated.

The Davis-Hocking model accurately predicts dynamic wetting using a material parameter (M) for contact-line mobility. This study confirms M

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Area of Science:

  • Fluid Dynamics
  • Surface Science
  • Materials Science

Background:

  • Dynamic wetting is described by contact angle (θ) and contact-line velocity (UCL).
  • The Davis-Hocking model uses a contact-line mobility parameter (M), often a fitting parameter.
  • Recent experiments allow direct measurement of M for inertial-capillary motions.

Purpose of the Study:

  • Investigate if the mobility parameter (M) in the Davis-Hocking model is a true material parameter.
  • Validate the predictive capability of the Davis-Hocking model with a measured M.
  • Compare the Davis-Hocking model with the Kistler model for sessile drop coalescence.

Main Methods:

  • Combined experimental and numerical study of binary sessile drop coalescence.
  • Experiments used water droplets on various surfaces with different wetting properties.
  • Numerical simulations employed the Davis-Hocking condition with a fixed, measured mobility parameter (M).

Main Results:

  • The Davis-Hocking model with a measured mobility parameter (M) successfully captured essential coalescence dynamics.
  • The model demonstrated superior performance compared to the Kistler dynamic contact angle model in many cases.
  • Side-view dynamics and projected swept areas confirmed the model's predictive accuracy.

Conclusions:

  • The mobility parameter (M) in the Davis-Hocking model is confirmed to be a material property.
  • This finding enables more accurate prediction of rapid wetting and dewetting behaviors.
  • The study validates the use of measured M for diverse solid-liquid-gas systems.