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Pancake bouncing: simulations and theory and experimental verification.

Lisa Moevius1, Yahua Liu, Zuankai Wang

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Pancake bouncing on superhydrophobic surfaces occurs when impacting fluid is expelled by capillary forces. This phenomenon, relevant for drop shedding and anti-icing, requires specific surface features and fluid dynamics.

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Area of Science:

  • Fluid Dynamics
  • Surface Science
  • Materials Science

Background:

  • Drops impacting superhydrophobic surfaces typically rebound spherically with minimal energy loss.
  • Recent observations show drops can bounce in an extended, pancake-like form before retracting.

Purpose of the Study:

  • To investigate the mechanism behind pancake bouncing on superhydrophobic surfaces.
  • To identify the criteria necessary for pancake bouncing to occur.

Main Methods:

  • Mesoscale simulations were employed to model drop impact dynamics.
  • Theoretical arguments were developed and compared against experimental data.

Main Results:

  • Pancake bouncing is driven by impacting fluid being slowed and expelled by capillary forces.
  • Two key criteria for pancake bouncing: appropriate fluid return time and sufficient kinetic energy.
  • Optimal surfaces for pancake bouncing have topological features around 200 μm.

Conclusions:

  • Pancake bouncing offers significantly reduced contact times (up to 5-fold) compared to conventional bouncing.
  • This phenomenon has potential applications in drop shedding and anti-icing technologies.