Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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)
  • Published : 2004.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Keywords

References

  1. Batchelor, G.K, H.K Moffat and M. G. Worster, 2000, Per-spectives in fluid dynamics, Cambridge Univ. Press, Cambridge
  2. Denn, M.M., 1980, Process Fluid Mechanics, Prentice-Hall Inc., New Jersey
  3. Ellis, A.T., J.G. Waugh and R.Y. Ting, 1970, Trans. ASME J. Basic Eng. 92, 459 https://doi.org/10.1115/1.3425031
  4. Homsy, G.M., 1987, Viscous Fingering in Porous Media, Annu. Rev. of Fluid Meeh. 19, 271 https://doi.org/10.1146/annurev.fl.19.010187.001415
  5. Saffman, P.G. and G.I. Taylor, 1958, The penetration of a fluid into a porous medium of Hele-Shaw cell containing a more viscous liquid, Proc. Roy. Soc. London A 245, 312 https://doi.org/10.1098/rspa.1958.0085
  6. Satas, D., 1999, Handbook of Pressure Sensitive Adhesive Tech-nology, 3rd ed., Satas & Associates, Warwick
  7. Shaqfeh, E.S.G., 1996, Purely elastic instabilities in viscometric flows, Annu. Rev. Fluid Meeh. 28, 129. https://doi.org/10.1146/annurev.fl.28.010196.001021
  8. Skeist, I, 1990, Handbook of adhesives, 3rd ed., Van Nortrand Reinhold, New York
  9. Tenijenhuis, K., 1990, The dynamic moduli and the first normal stress difference of the test fluid M1: A combination of results of measurements by various research groups, J. Non-New-tonian Fluid Meeh. 35, 169 https://doi.org/10.1016/0377-0257(90)85045-Z
  10. Tirumkudulu, M and W.B. Russel, 2003, On the measurement of tack for adhesives, Phys. Fluids 15, 1588 https://doi.org/10.1063/1.1571058
  11. Tirumkudulu, M., W.B. Russel and T.J. Huang, 2003, Measuring the tack of waterborne adhesives, J. Rheol. 1399
  12. Vlad, D.H. and J.V., Maher, 2000, Tip-splitting instabilities in the channel Saffman-Taylor flow of constant viscosity elastic flu-ids, Rhys. Rev. E. 61, 5439 https://doi.org/10.1103/PhysRevE.61.5439