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

Content Provider	Springer Nature Link
Author	Sibillo, Vincenzo Simeone, Mari Guido, Stefa
Copyright Year	2004
Abstract	The effect of matrix elasticity on the break-up of an isolated Newtonian drop under step shear flow is herein presented. Constant-viscosity, elastic polymer solutions (Boger fluids) were used as matrix phase. Newtonian silicon oils were used as drop phase. Three viscosity ratios were explored (drop/matrix), i.e. 2, 0.6 and 0.04. Following the theoretical analysis of Greco [Greco F (2002) J Non-Newtonian Fluid Mech 107:111–131], the role of elasticity on drop fluid dynamics was quantified according to the value of the parameter p=τ/τem, where τ is a constitutive relaxation time of the matrix fluid and τem is the emulsion time. Different fluids were prepared in order to have p ranging from 0.1 to 10. At all the viscosity ratios explored, break-up was hindered by matrix elasticity. The start-up transient of drop deformation, at high, but sub-critical capillary numbers, showed an overshoot, during which the drop enhanced its orientation toward the flow direction. Both phenomena increase if the p parameter increases. Finally, the non-dimensional pinch-off length and break-up time were also found to increase with p.
Starting Page	449
Ending Page	456
Page Count	8
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	43
Issue Number	5
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-05-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drop break up Boger fluid Viscoelasticity Shear flow Optical microscopy
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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