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Related Experiment Videos

Avoided critical behavior in dynamically forced wetting.

Jacco H Snoeijer1, Giles Delon, Marc Fermigier

  • 1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 CNRS-ESPCI, Paris, France.

Physical Review Letters
|May 23, 2006
PubMed
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Discoveries in dynamical wetting transitions reveal that solitary waves, not critical points, govern liquid film deposition. This finding clarifies the finite relaxation times and unique deposited liquid structures observed during plate withdrawal experiments.

Area of Science:

  • Fluid dynamics
  • Surface science
  • Wetting phenomena

Background:

  • Coating solid objects with nonwetting liquids is limited by a critical receding contact line speed.
  • Dynamical wetting transitions, where liquid films deposit onto surfaces, have been theoretically predicted to be critical.
  • Previous predictions suggested diverging time scales and disappearing stationary menisci at these critical transitions.

Purpose of the Study:

  • To investigate the nature of the dynamical wetting transition during liquid film deposition.
  • To experimentally and theoretically validate or refute the predicted critical behavior of this wetting transition.
  • To understand the underlying mechanisms and resulting structures of the deposited liquid film.

Main Methods:

  • Experimental study of liquid film deposition by withdrawing a vertical plate from a liquid reservoir.

Related Experiment Videos

  • Theoretical analysis to model the fluid dynamics of the receding contact line and film formation.
  • Comparison of experimental observations with theoretical predictions regarding transition criticality and time scales.

    • Main Results:

    • The dynamical wetting transition is demonstrated to be caused by the formation of a solitary wave.
    • This solitary wave mechanism occurs well below the previously predicted critical point.
    • Consequently, relaxation times at the transition remain finite, contrary to critical point predictions.

    Conclusions:

    • The dynamical wetting transition is not a critical phenomenon as previously predicted.
    • Solitary wave formation dictates the transition, leading to finite relaxation times.
    • The deposited liquid structure features a capillary ridge that deviates from the standard Landau-Levich film model.