NDLI: Droplet deformation of a strongly shear thinning dense suspension of polymeric micelles

Content Provider	Springer Nature Link
Author	Boufarguine, Majdi Reu, Frederic Nicolai, Taco Benyahia, Lazhar
Copyright Year	2010
Abstract	We investigated the deformation of a strong shear thinning droplet undergoing simple shear flow in a Newtonian liquid. The droplet was an aqueous solution of poly(ethylene oxide) end capped with an alkyl group that forms spherical micelles in aqueous solution. At high concentrations and below a critical temperature, the jammed micelles showed strong shear thinning behaviour, and neither a yield stress nor a Newtonian viscosity was observed. At small shear rates, the droplet rotated and aligned in the flow, but did not deform or only very weakly. At high shear rates, the droplet deformation increased with increasing shear rate. The deformed droplet did not relax after the shear was stopped except for a modest rounding of the edges. For each shear rate, an apparent viscosity, η ad, of the equivalent Newtonian droplet was calculated assuming affine deformation. η ad showed a power law dependence on the capillary number Ca with an exponent of − 1.8 and was larger than the shear viscosity of the micelle suspension at the same shear rates. The results were explained by the existence of a strong gradient of the viscosity inside the droplet leading to a very low viscosity fluid layer near the droplet/matrix interface.
Starting Page	647
Ending Page	655
Page Count	9
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	49
Issue Number	6
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drop deformation Relaxation Retraction Shear thinning fluid Micellar suspension Food Science Polymer Sciences Characterization and Evaluation of Materials Mechanical Engineering Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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