The combined influence of a rough surface and thin fluid film upon the splashing threshold and splash dynamics of a droplet impacting onto them

Randy Lee Vander Wal, Gordon M. Berger, Steven D. Mozes

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Surface roughness can have a critical effect upon the splashing threshold and dynamics of a drop impacting on either a dry or rough solid surface or one coated by a thin fluid film. As most coating applications and spray systems quickly evolve to a state where the droplets impinge upon fluid deposited by preceding droplets, the combined contributions of surface roughness and a pre-deposited thin liquid film of comparable thickness upon droplet impingement dynamics are examined. For comparison, we include results for droplets impacting on a smooth, dry surface and a smooth surface wetted by a thin fluid film. The inclusion of surface roughness considerably lowers the splashing threshold and alters the splashing dynamics such that differences in fluid surface tensions between 20.1 and 72.8 dynes/cm or viscosities between 0.4 and 3.3 cP have little effect.

Original languageEnglish (US)
Pages (from-to)23-32
Number of pages10
JournalExperiments in Fluids
Volume40
Issue number1
DOIs
StatePublished - Jan 1 2006

Fingerprint

splashing
fluid films
surface roughness
Fluids
thresholds
Surface roughness
impingement
fluids
solid surfaces
sprayers
interfacial tension
inclusions
viscosity
coatings
Liquid films
Surface tension
liquids
Viscosity
Thin films
Coatings

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

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The combined influence of a rough surface and thin fluid film upon the splashing threshold and splash dynamics of a droplet impacting onto them. / Vander Wal, Randy Lee; Berger, Gordon M.; Mozes, Steven D.

In: Experiments in Fluids, Vol. 40, No. 1, 01.01.2006, p. 23-32.

Research output: Contribution to journalArticle

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