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Bouncing microdroplets on hydrophobic surfaces.

Jamie McLauchlan1, Jim S Walker2, Vatsal Sanjay3

  • 1Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.

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|September 4, 2025
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Summary
This summary is machine-generated.

Droplet bouncing on surfaces depends on velocity, not just size or fluid properties. This study reveals a velocity-dependent bouncing criterion for microdroplets on hydrophobic surfaces, crucial for aerosol science.

Keywords:
aerosolsbouncingdepositiondropletmicrofluidics

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Aerosol science

Background:

  • Droplet behavior on surfaces is generally understood by velocity: slow droplets stick, fast ones splash or bounce.
  • Recent studies indicated droplet behavior on nonwetting surfaces depends on size and fluid properties, independent of velocity.
  • However, the role of velocity on poorly wetting surfaces remains less understood.

Purpose of the Study:

  • To investigate the velocity-dependent criterion for microdroplet bouncing on poorly wetting surfaces.
  • To quantify the interplay of kinetic energy, dissipation, and surface adhesion in droplet bouncing.
  • To elucidate fundamental processes in aerosol science and technology.

Main Methods:

  • Theoretical analysis of droplet-surface interactions.
  • Experimental investigation using microdroplets (30-50 μm) on hydrophobic surfaces (e.g., Teflon).
  • Quantification of bouncing criteria by varying droplet velocity and analyzing associated phenomena.

Main Results:

  • A velocity-dependent criterion for droplet bouncing was identified on poorly wetting surfaces.
  • Bouncing criteria can be as high as 6 m/s for microdroplets (30-50 μm) on hydrophobic surfaces.
  • Observed phenomena include air bubble entrapment and satellite droplet formation.

Conclusions:

  • Microdroplet bouncing on hydrophobic surfaces is velocity-dependent, contrary to some prior assumptions for nonwetting surfaces.
  • The findings provide a fundamental understanding of inertial microdroplet dynamics.
  • This research is critical for applications in aerosol science and technology.