Interfacial instability of Boger fluid in the pull-off test between two circular plates

Hyoung Mi Kang, Chongyoup Kim

Research output: Contribution to journalArticlepeer-review


In this study the deformation of liquid-air interface of Newtonian or Boger fluids filled between two parallel-plates geometry was investigated when two surfaces were separated at a constant speed. The interface between the fluid and air showed either stable or unstable deformation depending on experimental conditions. Repeated experiments for a wide range of experimental conditions revealed that the deformation mode could be classified into three types: 'stable region', 'fingering' and 'cavitation'. The experimental condition for the mode of deformation was plotted in a capillary number vs. Deborah number phase plane. It has been found that the elasticity of Boger fluids destabilize the interface deformation. On the other hand, the elasticity suppresses the formation and growth of cavities.

Original languageEnglish
Pages (from-to)219-226
Number of pages8
JournalKorea Australia Rheology Journal
Issue number4
Publication statusPublished - 2004 Dec


  • Boger fluid
  • Cavitation
  • Pressure sensitive adhesive
  • Pull-off test
  • Tack
  • Viscous fingering

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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