Transient shear banding in time-dependent fluids

Xavier Illa*, Antti Puisto, Arttu Lehtinen, Mikael Mohtaschemi, Mikko J. Alava

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
217 Downloads (Pure)

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.

Original languageEnglish
Article number022307
Pages (from-to)1-5
JournalPhysical Review E
Volume87
Issue number2
DOIs
Publication statusPublished - 22 Feb 2013
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Transient shear banding in time-dependent fluids'. Together they form a unique fingerprint.

  • Cite this