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Title: Transient shear banding in time-dependent fluids
Author: Illa i Tortós, Xavier
Puisto, Antti
Lehtinen, Arttu
Mohtaschemi, Mikael
Alava, Mikko J.
Keywords: Fluids complexos
Mecànica de fluids
Complex fluids
Fluid mechanics
Issue Date: 22-Mar-2013
Publisher: American Physical Society
Abstract: We study the dynamics of shear-band formation and evolution using a simple rheological model. The description couples the local structure and viscosity to the applied shear stress. We consider in detail the Couette geometry, where the model is solved iteratively with the Navier-Stokes equation to obtain the time evolution of the local velocity and viscosity fields. It is found that the underlying reason for dynamic effects is the nonhomogeneous shear distribution, which is amplified due to a positive feedback between the flow field and the viscosity response of the shear thinning fluid. This offers a simple explanation for the recent observations of transient shear banding in time-dependent fluids. Extensions to more complicated rheological systems are considered.
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It is part of: Physical Review E, 2013, vol. 87, num. 022307, p. 022307-1-022307-5
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ISSN: 1539-3755
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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