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Experiments in Fluids

, 55:1713 | Cite as

Oblique impacts of water drops onto hydrophobic and superhydrophobic surfaces: outcomes, timing, and rebound maps

  • C.  Antonini
  • F. Villa
  • M. Marengo
Research Article

Abstract

This paper presents an experimental study on water drop oblique impacts onto hydrophobic and superhydrophobic tilted surfaces, with the objective of understanding drop impact dynamics and the conditions for drop rebound on low wetting surfaces. Drop impact experiments were performed with millimetric water drops with Weber numbers in the range 25 < We < 585, using different surfaces with advancing contact angles 111° < θ A < 160° and receding contact angles 104° < θ R < 155°. The analysis of oblique impacts onto tilted surfaces led to the definition of six different impact regimes: deposition, rivulet, sliding, rolling, partial rebound, and rebound. For superhydrophobic surfaces, surface tilting generally enhanced drop rebound and shedding from the surface, either by reducing drop rebound time up to 40 % or by allowing drop rebound even when impalement occurred in the vicinity of the impact region. On hydrophobic surfaces, rebound was never observed for tilt angles higher than 45°.

Keywords

Contact Angle Tilt Angle Weber Number Superhydrophobic Surface Contact Angle Hysteresis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors acknowledge Regione Lombardia for funding the project “Strumenti innovativi per il progetto di sistemi antighiaccio per l’aeronautica” (within the Framework Agreement) and Alenia Aermacchi for financial support. CA acknowledges funding by a Marie Curie Intra-European Fellowship, within the 7th European Community Framework Programme (ICE2, 301174). The authors also thank I. Bernagozzi and I. Malavasi (University of Bergamo), H. Chen (University of Alberta, Canada) and A. Amirfazli (University of York, Canada) for sample preparation. CA acknowledges Daniele Foresti (ETH Zurich) for helpful discussions.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of EngineeringUniversity of BergamoDalmineItaly
  2. 2.Laboratory of Thermodynamics in Emerging Technologies, Mechanical and Process Engineering DepartmentETH ZurichZurichSwitzerland
  3. 3.School of Computing, Engineering and MathematicsUniversity of BrightonBrightonUK

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