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Pinning-Depinning Transition Behavior of Droplets on Geometric Edges.

Yi Sun1, Lefeng Wang1, Lie Bi2

  • 1State Key Laboratory of Robotics and Systems, Harbin Institute of Technology, Harbin 150001, China.

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Summary

Droplet pinning at sharp edges is quantified using a new friction model. This model predicts the critical tilt angle for depinning, considering droplet volume, edge geometry, and surface wettability.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Wettability and contact line phenomena

Background:

  • Droplet contact line pinning at sharp edges is a known phenomenon.
  • Pinning is influenced by edge geometry and surface wettability.
  • Quantitative understanding of the pinning-depinning transition is lacking.

Purpose of the Study:

  • To develop a quantitative model for droplet depinning at sharp edges.
  • To introduce a critical tilt angle (αmax) as a metric for depinning.
  • To investigate the influence of droplet volume, edge geometry, and surface wettability on depinning.

Main Methods:

  • Development of a friction-based theoretical model.
  • Incorporation of droplet volume, edge geometry, and surface wettability into the model.
  • Extension of the model to chemically heterogeneous edges.
  • Simulation and validation against experimental data.

Main Results:

  • The model quantitatively characterizes the critical depinning condition.
  • Droplet volume, edge geometry, and surface wettability monotonically affect the critical tilt angle (αmax).
  • A specific relationship between surface properties can prevent pinning.

Conclusions:

  • The developed friction model provides a quantitative framework for understanding droplet depinning.
  • The critical tilt angle (αmax) effectively characterizes the pinning-depinning transition.
  • The findings offer insights into controlling droplet behavior on structured surfaces.