Effect of flow rate variation on the frequency response in slot coating process with different upstream sloped die geometries

Won Gi Ahn, Si Hyung Lee, Jaewook Nam, Hyun Wook Jung

Research output: Contribution to journalArticle

2 Citations (Scopus)


The sensitivity of slot coating process with different sloped upstream die configurations has been investigated using the viscocapillary model for a coating liquid with constant viscosity (Newtonian) through frequency response technique. Amplitude ratios of coating thickness with respect to a sinusoidal disturbance at flow rate are compared under different input frequency and upstream die lip angle conditions. Amplitude ratio values decrease as the upstream die lip angle increases, implying that the coating system is less sensitive to the given disturbance due to the larger space condition in the upstream die region. Amplitude ratio curves obtained from various conditions can be usefully unified in a single one with the help of new dimensionless time between fluid time scale in upstream region and perturbed time scale by input frequency.

Original languageEnglish
Article numberA020
Pages (from-to)1218-1221
Number of pages4
JournalKorean Journal of Chemical Engineering
Issue number7
Publication statusPublished - 2015 Jun 1



  • Frequency Response
  • Operability Coating Window
  • Sensitivity
  • Sloped Slot Die
  • Slot Coating

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this