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Dewetting processes in a cylindrical geometry.

G Callegari1, A Calvo, J P Hulin

  • 1Grupo de Medios Porosos, Facultad de Ingeniería, Universidad de Buenos-Aires, Paseo Colón 850, 1063 Buenos Aires, Argentina.

The European Physical Journal. E, Soft Matter
|February 8, 2005
PubMed
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Dewetting of water-glycerol films in tubes shows the dewetting capillary number increases with film thickness, a trend influenced by viscous dissipation differences compared to planar surfaces.

Area of Science:

  • Fluid dynamics
  • Surface science
  • Rheology

Background:

  • Dewetting of liquid films is crucial in various industrial processes.
  • Understanding dewetting in confined geometries like tubes is complex.
  • Previous studies often focused on planar surfaces, limiting applicability to curved geometries.

Purpose of the Study:

  • To experimentally investigate the dewetting of water-glycerol liquid films in PVC cylindrical tubes.
  • To compare dewetting behavior in cylindrical versus planar geometries.
  • To elucidate the role of viscous dissipation in cylindrical dewetting.

Main Methods:

  • Experimental study of liquid film dewetting in cylindrical tubes.
  • Utilized water-glycerol solutions with varying viscosities.

Related Experiment Videos

  • Employed a numerical model to analyze viscous dissipation in the dewetting bump.

    • Main Results:

    • The dewetting capillary number (Ca(vd)) increases with film thickness (ho) in cylindrical tubes, unlike planar surfaces.
    • This trend is largely independent of solution viscosity.
    • Observed differences in viscous dissipation distribution between planar and cylindrical geometries contribute to the observed behavior.

    Conclusions:

    • Cylindrical geometry significantly alters liquid film dewetting dynamics compared to planar surfaces.
    • Viscous dissipation distribution is a key factor explaining enhanced dewetting in tubes.
    • The findings provide insights into fluid behavior in confined, curved systems.