Break-up of a Newtonian drop in a viscoelastic matrix under simple shear flow

Sibillo, Vincenzo; Simeone, M.; Guido, Stefano

doi:10.1007/s00397-004-0374-7

Cited by 46 publications

(30 citation statements)

References 13 publications

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“…Figure 10 shows micrographs for system 5 of table 2 with the Boger fluid matrix at λ = 0.75, De m = 1.56 and Ca = 0.50. This is slightly above the critical capillary number, in agreement with experimental values of Ca cr in figure 10 of [11].…”

Section: Breakup Of a Newtonian Drop In A Boger Fluid Matrixsupporting

confidence: 90%

“…The breakup of a Newtonian droplet in a Boger fluid under simple shear is investigated experimentally in [11] at several viscosity ratios. The end-pinching that takes place for the Newtonian reference system at viscosity ratio roughly 1 is also observed for a highly viscoelastic matrix.…”

Section: Breakup Of a Newtonian Drop In A Boger Fluid Matrixmentioning

confidence: 99%

“…Matrix viscoelasticity is now known to significantly affect the droplet dynamics. First, severe overshoots may occur in the transient evolution toward a stationary state, either in startup of shear flow [11,12,13] or startup of planar extensional flow [14]. Possible causes for this overshoot are discussed in [15].…”

Section: Introductionmentioning

confidence: 99%

“…However, the majority of these studies include other hydrodynamic effects, nonhomogeneities in the applied flow field, shear-thinning behavior, or differences in the viscosity ratio among the various blend systems. A clearer distinction of the effect of component viscoelasticity is obtained in [11] for breakup of a single Newtonian droplet in a Boger fluid under simple shear. It is found that matrix viscoelasticity indeed inhibits droplet breakup in shear.…”

Section: Introductionmentioning

confidence: 99%

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

Verhulst

Cardinaels

Moldenaers

et al. 2009

Journal of Non-Newtonian Fluid Mechanics

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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 to 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.

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Section: Breakup Of a Newtonian Drop In A Boger Fluid Matrixsupporting

confidence: 90%

Section: Breakup Of a Newtonian Drop In A Boger Fluid Matrixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Verhulst

Cardinaels

Moldenaers

et al. 2009

Journal of Non-Newtonian Fluid Mechanics

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show abstract

“…[1][2][3][4][5][6][7][8] Higher deformations require a fully numerical approach [9][10][11] which is computationally expensive because of the need to capture viscoelastic stresses that have large gradients localized next to the drop surface. At this time, a two-dimensional ͑2D͒ numerical simulation is completed on a personal computer in a few hours.…”

Section: Introductionmentioning

confidence: 99%

A comparison of viscoelastic stress wakes for two-dimensional and three-dimensional Newtonian drop deformations in a viscoelastic matrix under shear

2009

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A recent experimental study of a Newtonian drop suspended in a viscoelastic matrix undergoing simple shear displays a transient overshoot in drop deformation which is qualitatively similar to two-dimensional ͑2D͒ numerical simulation results. Despite the similarity, an interpretation in light of the 2D result is misleading because the overshoot is absent in the fully three-dimensional ͑3D͒ simulation. This motivates a study of regimes where qualitatively different and interesting features such as overshoots in deformation occur for a 2D drop but not for a 3D drop. The influence of viscoelastic "wakes" that emanate from the drop tips is reported. The viscoelastic wakes are larger and of higher magnitude in 3D than in 2D, and lead to more deformation in 3D. During drop evolution, the less deformed drop is found to be aligned more with the flow direction. As the drop-to-matrix viscosity ratio increases from 1 to past 3, drop rotation is promoted, with accompanying retraction when the capillary number is sufficiently high. Thus, a 3D overshoot in deformation is promoted with increasing viscosity ratio.

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Morphology Development in Immiscible Polymer Blends

Cardinaels

Moldenaers

2016

Polymer Morphology

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Break-up of a Newtonian drop in a viscoelastic matrix under simple shear flow

Cited by 46 publications

References 13 publications

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

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

A comparison of viscoelastic stress wakes for two-dimensional and three-dimensional Newtonian drop deformations in a viscoelastic matrix under shear

Morphology Development in Immiscible Polymer Blends

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