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Related Experiment Videos

Wetting at high capillary numbers.

Terence D Blake1, Rosemary A Dobson, Kenneth J Ruschak

  • 1Research & Development, Kodak Limited, Harrow, HA1 4TY, UK. terrydblake@btinternet.com

Journal of Colloid and Interface Science
|September 24, 2004
PubMed
Summary
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Hydrodynamic assist enables high-speed liquid coating by promoting wetting and preventing air entrainment. This study demonstrates successful curtain coating at higher speeds, supporting the role of hydrodynamic forces in postponing air entrainment.

Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials engineering

Background:

  • Liquid coating on solids is crucial for industries.
  • Dynamic wetting failure, causing air entrainment, limits high-speed coating.
  • Hydrodynamic assist can improve wetting and delay air entrainment.

Purpose of the Study:

  • To investigate the effectiveness of hydrodynamic assist in curtain coating.
  • To explore the limits of air entrainment postponement at high capillary numbers.
  • To support the hypothesis that hydrodynamic forces drive high-speed coating.

Main Methods:

  • Conducted curtain coating experiments within a specific capillary number range (0.5 < Ca < 50).
  • Utilized flow visualization techniques to observe wetting behavior.

Related Experiment Videos

  • Analyzed the impact of hydrodynamic forces on dynamic contact angles.

    • Main Results:

    • Achieved successful curtain coating at capillary numbers up to 50.
    • Observed that hydrodynamic assist significantly reduces dynamic contact angles.
    • Demonstrated the postponement of air entrainment to higher capillary numbers.

    Conclusions:

    • Intense hydrodynamic assist is a key factor in enabling high-speed coating.
    • The findings support the hypothesis that hydrodynamic forces, not air dissolution, are responsible for postponing air entrainment.
    • This research validates methods for achieving efficient, high-speed liquid film deposition.