Korea-Australia Rheology Journal

  • 제16권4호
  • /
  • Pages.219-226
  • /
  • 2004
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  • 1226-119X(pISSN)
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  • 2093-7660(eISSN)
한국유변학회 (The Korean Society of Rheology)
권호 표지

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

  • Kang Hyoung Mi (Department of Chemical and Biological Engineering, Korea University) ;
  • Kim Chongyoup (Department of Chemical and Biological Engineering, Korea University)
  • 발행 : 2004.12.01
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초록

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.

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