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 language | English (US) |
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Pages (from-to) | 44-57 |
Number of pages | 14 |
Journal | Journal of Non-Newtonian Fluid Mechanics |
Volume | 156 |
Issue number | 1-2 |
DOIs | |
State | Published - Jan 2009 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Chemical Engineering
- General Materials Science
- Condensed Matter Physics
- Mechanical Engineering
- Applied Mathematics
Keywords
- Blend morphology
- Drop breakup
- Drop deformation
- Oldroyd-B
- VOF method
- Viscoelasticity