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Dynamic contact angles under evaporation.

Robert M Ybarra1, P Neogi

  • 1Chemical Engineering Department, University of Missouri--Rolla, Missouri 65409, USA.

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

This study models wetting kinetics considering heat transfer, evaporation, and the Marangoni effect. The model accurately predicts dynamic contact angles and suggests a new contact line instability.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Surface Science

Background:

  • Understanding wetting phenomena is crucial in various scientific and industrial applications.
  • Existing models often simplify or neglect factors like heat transfer and evaporation.
  • The Marangoni effect significantly influences fluid interfaces, especially with temperature gradients.

Purpose of the Study:

  • To investigate wetting kinetics incorporating heat transfer, evaporation, and the Marangoni effect.
  • To develop a theoretical model for dynamic contact angle prediction.
  • To explore potential instabilities at the contact line.

Main Methods:

  • Utilized a theoretical approach based on the work by Joanny and de Gennes.
  • Solved for the dynamic contact angle (α) by balancing surface work rate and dissipation rate.
  • Analyzed the relationship between dynamic contact angle and capillary number (Ca).

Main Results:

  • The derived dynamic contact angle (α) as a function of capillary number (Ca) shows excellent agreement with experimental data.
  • Qualitative comparisons were successfully made for scenarios lacking quantitative experimental data.
  • A novel form of contact line instability was theoretically predicted.

Conclusions:

  • The developed model provides a robust framework for understanding complex wetting phenomena.
  • The predicted contact line instability warrants further experimental investigation.
  • This research offers insights into fluid behavior at interfaces under combined thermal and evaporative conditions.

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