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Water droplet stability on striped surfaces depends on wettability. Droplet breakup occurs when capillary bridge pressure exceeds liquid finger pressure, influenced by stripe width ratios.

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Area of Science:

  • Surface Science
  • Fluid Dynamics
  • Materials Science

Background:

  • Understanding droplet behavior on heterogeneous surfaces is crucial for applications like microfluidics and coatings.
  • Wettability patterns significantly influence liquid behavior, leading to phenomena like droplet breakup.

Purpose of the Study:

  • To investigate the stability of water droplets on striped surfaces with varying wettability.
  • To determine the critical conditions for droplet breakup based on stripe widths and contact angle contrasts.

Main Methods:

  • Experimental observation of droplet behavior.
  • Numerical computation of droplet breakup boundaries.
  • Development of a scaling model for predicting critical breakup conditions.

Main Results:

  • The minimum contact angle contrast for droplet breakup increases with the hydrophobic contact angle.
  • An unstable regime was identified, characterized by liquid fingers and a capillary bridge.
  • A critical capillary bridge width, dependent on stripe width ratios, was found to precede breakup.

Conclusions:

  • Droplet instability occurs when Laplace pressure in the capillary bridge overcomes the pressure in hydrophilic liquid fingers.
  • The developed scaling model accurately predicts the critical width for droplet breakup.
  • Surface wettability patterns critically dictate droplet stability and breakup dynamics.