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Experiments in Fluids

, Volume 52, Issue 6, pp 1449–1463 | Cite as

On the impact of viscous drops onto dry smooth surfaces

  • Julián Palacios
  • Julio HernándezEmail author
  • Pablo Gómez
  • Claudio Zanzi
  • Joaquín López
Research Article

Abstract

An experimental study of the impact of glycerol/water drops onto a dry glass surface at Reynolds and Weber numbers around the splashing/deposition threshold is presented. Some new observed phenomena that may shed further light on the mechanisms underlying air bubble entrainment and splashing for high-viscosity liquids are presented and discussed. The experiments were recorded with a high-speed camera using two complementary lighting setups that enhance the visualization of different features of the air entrainment phenomena: backlighting with a light diffuser and oblique lighting without diffuser. Besides the ring of micro-bubbles surrounding the central entrapped bubble and the cloud of bubbles entrained as a result of the interaction between a levitated thin film and the solid surface, which have been studied by other authors in previous works, a second ring of micro-bubbles that delimits the outer cloud of bubbles has been detected in our investigation. Attention is mainly focused on analyzing the dependency of the behavior of the two rings of micro-bubbles on the drop impact velocity, the ranges of the relevant dimensionless numbers in which the rings are formed and the existence, in certain impact conditions, of an abrupt increase in the size of the second ring, which substantially modifies the impact outcome.

Keywords

Contact Line Capillary Number Drop Impact Secondary Droplet Central Bubble 
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 gratefully acknowledge the support of the Spanish Ministerio de Ciencia e Innovación under grants DPI2007-63275 and DPI2010-21696-C02.

Supplementary material

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348_2012_1264_MOESM2_ESM.pdf (96 kb)
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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Julián Palacios
    • 1
  • Julio Hernández
    • 1
    Email author
  • Pablo Gómez
    • 1
  • Claudio Zanzi
    • 1
  • Joaquín López
    • 2
  1. 1.Departamento de Mecánica, ETS de Ingenieros IndustrialesUNEDMadridSpain
  2. 2.Departamento de Ingeniería de Materiales y Fabricación, ETSIIUniversidad Politécnica de CartagenaCartagenaSpain

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