Influence of viscoelasticity on drop deformation and orientation in shear flow. Part 2: Dynamics

Kristof Verhulst, Ruth Cardinaels, Paula Moldenaers, Shahriar Afkhami, Yuriko Renardy

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

An experimental study of drop dynamics under shear is conducted for five fluid pairs: a reference Newtonian system, two systems with a viscoelastic drop in a Newtonian matrix, one with a Newtonian drop in a viscoelastic matrix, all at drop to matrix viscosity ratio λ = 1.5, and a separate case at λ = 0.75. The viscoelastic liquids are either a Boger fluid or a shear-thinning viscoelastic fluid satisfying an Ellis model. Deborah numbers in the range 1-2 and a range of capillary numbers from low to above breakup conditions are addressed. The results focus on three aspects: relaxation after cessation of shear, a new viscoelastic drop breakup scenario, and the effect of shear flow history on drop breakup. Numerical simulations with the 3D volume-of-fluid PROST method complement the experimental results.

Original languageEnglish (US)
Pages (from-to)44-57
Number of pages14
JournalJournal of Non-Newtonian Fluid Mechanics
Volume156
Issue number1-2
DOIs
StatePublished - Jan 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

Keywords

  • Blend morphology
  • Drop breakup
  • Drop deformation
  • Oldroyd-B
  • VOF method
  • Viscoelasticity

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