Influence of viscosity and impingement speed on intense hydrodynamic assist in curtain coating

J. O. Marston*, M. J. H. Simmons, S. P. Decent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The onset of air entrainment for curtain coating onto a pre-wetted substrate was studied experimentally in similar parameter regimes to commercial coating [Re = ρ Q/μ = O(1), We = ρ Q u c /σ = O(10), Ca= μ U/σ = O(1)]. As with coating onto dry substrates, a large flow-rate dependence was observed; termed hydrodynamic assist. The influence of the impingement speed and viscosity are shown to be critical and three qualitatively different regimes of assist are identified. The interaction of the impinging curtain with the pre-existing film also led to a significant hysteretic effect throughout the flow rate-substrate speed parameter space.
Original languageEnglish
Pages (from-to)483-488
Number of pages6
JournalExperiments in Fluids
Volume42
Early online date8 Feb 2007
DOIs
Publication statusPublished - Mar 2007
Externally publishedYes

Keywords

  • Contact Line
  • Wheel Speed
  • Impingement Speed
  • Intense Mode
  • Substrate Speed

ASJC Scopus subject areas

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

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