Viscoelastic Taylor-Couette instability of shear banded flow

TL;DR

This paper investigates the origins of roll cells in shear banded flows within Couette geometries, identifying two distinct instabilities driven by normal stresses that explain recent experimental observations.

Contribution

It provides a numerical analysis distinguishing between interfacial and bulk viscoelastic instabilities as causes of roll cells in shear banded flows.

Findings

Identifies interfacial instability driven by second normal stress jump.

Discovers bulk viscoelastic Taylor-Couette instability caused by large first normal stress.

Explains different experimental signatures of roll cells based on instability type.

Abstract

We study numerically shear banded flow in planar and curved Couette geometries. Our aim is to explain two recent observations in shear banding systems of roll cells stacked in the vorticity direction, associated with an undulation of the interface between the bands. Depending on the degree of cell curvature and on the material's constitutive properties, we find either (i) an instability of the interface between the bands driven by a jump in second normal stress across it; or (ii) a bulk viscoelastic Taylor Couette instability in the high shear band driven by a large first normal stress within it. Both lead to roll cells and interfacial undulations, but with a different signature in each case. Our work thereby suggests a different origin for the roll cells in each of the recent experiments.