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Related Experiment Videos

On the Landau-Levich transition.

Maniya Maleki1, Etienne Reyssat, David Quéré

  • 1Institute for Advanced Studies in Basic Sciences, Zanjan 45195, P.O. Box 45195-1159, Iran.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 1, 2007
PubMed
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The Landau-Levich transition, a dynamic change when pulling a solid from a partially wetting liquid, shows a possible discontinuous contact angle. This study models the meniscus shape during this entrainment process.

Area of Science:

  • Fluid dynamics
  • Surface science
  • Wettability phenomena

Background:

  • The Landau-Levich transition describes liquid film entrainment when a solid is withdrawn from a partially wetting liquid.
  • Understanding this transition is crucial for processes involving liquid-solid interactions.

Purpose of the Study:

  • To investigate the nature of the Landau-Levich transition.
  • To determine if the macroscopic contact angle is discontinuous at the transition.
  • To model the meniscus shape and understand the transition dynamics.

Main Methods:

  • Experimental measurement of macroscopic contact angles using multiple methods.
  • Observation of liquid film entrainment above a threshold velocity.
  • Development of a theoretical model for the transition.

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Main Results:

  • Evidence suggests a potential discontinuity in the macroscopic contact angle at the Landau-Levich transition.
  • A model was developed to explain the observed contact angle behavior.
  • The model also addresses the meniscus shape during solid withdrawal.

Conclusions:

  • The Landau-Levich transition may involve a discontinuous change in contact angle.
  • The developed model provides insights into the physics of liquid entrainment and meniscus formation.
  • Further research can explore the implications for various industrial and scientific applications.