The interface migration in shear-banded micellar solutions

In this work, we study the diffusion of the interface between bands in wormlike micellar solutions that exhibit shear banding flow regimes, namely, systems undergoing coexistence of states of different shear rates along a constant stress plateau. The migration of the interface between bands possessi...

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Bibliographic Details
Published in:Rheologica acta 2017-09, Vol.56 (9), p.765-778
Main Authors: Garcia-Sandoval, Juan Paulo, Bautista, Fernando, Puig, Jorge Emilio, Manero, Octavio
Format: Article
Language:English
Subjects:
Birefringence
Characterization and Evaluation of Materials
Chemistry and Materials Science
Complex Fluids and Microfluidics
Constitutive equations
Constitutive relationships
Dependence
Food Science
Materials Science
Mechanical Engineering
Migration
Original Contribution
Polymer Sciences
Shear flow
Shear rate
Soft and Granular Matter
Viscosity
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Summary:In this work, we study the diffusion of the interface between bands in wormlike micellar solutions that exhibit shear banding flow regimes, namely, systems undergoing coexistence of states of different shear rates along a constant stress plateau. The migration of the interface between bands possessing different birefringence levels is predicted by the BMP (Bautista-Manero-Puig) model in which a structural parameter (the fluidity) presents two states with differing order separated by an interface. The mechanical potential derived from the constitutive equations and a diffusion term for the structure evolution equation predict various time scales of interface migration at the inception of shear flow and under shear-rate changes along the plateau stress. It is shown that the extremes of the plateau (binodals) correspond to the minima in the mechanical potential as a function of fluidity or shear rate. We also predict the dependence of the diffusive length scale on the applied shear rate.
ISSN:0035-4511
1435-1528
DOI:10.1007/s00397-017-1031-2