Effect of upstream meniscus shape on dynamic wetting and operating limits of Newtonian coating liquids in slot coating bead flows

Won Gi Ahn, Si Hyung Lee, Jaewook Nam, See Jo Kim, Kwan Young Lee, Hyun Wook Jung

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The coating bead flow and operability window for Newtonian coating liquids are theoretically and experimentally investigated in the slot coating process, with a focus on the shape of the upstream meniscus and contact angles. From the flow visualization in the coating bead region, the contact angles of the upstream meniscus were measured by changing the flow rate and web speed under uniform operating conditions. It was confirmed that the dynamic contact angle is closely related to the capillary number in this process, based on the Hoffman–Voinov–Tanner model. The viscocapillary and two-dimensional Navier–Stokes models using the experimentally observed contact angles accurately predicted the coating bead dynamics and operability windows for two Newtonian liquids.

Original languageEnglish
Pages (from-to)1067-1076
Number of pages10
JournalJournal of Coatings Technology and Research
Volume15
Issue number5
DOIs
Publication statusPublished - 2018 Sep 1

Keywords

  • Dynamic contact angle
  • Operability window
  • Slot coating
  • Static contact angle
  • Upstream meniscus

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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