Matched asymptotic solutions for the steady banded flow of the diffusive Johnson-Segalman model in various geometries

Details Matched asymptotic solutions for the steady banded flow of the diffusive Johnson-Segalman model in various geometries Matched asymptotic solutions for the steady banded flow of the diffusive Johnson-Segalman model in various geometries

1999-11-04

arxiv.org/abs/cond-mat/9911064v1

Journal of Non-Newtonian Fluid Mechanics 91 (2000) 141-162

Physics

Condensed Matter

Soft Condensed Matter

15 pp, to be published in Journal of Non-Newtonian Fluid Mechanics

Scientific paper

We present analytic solutions for steady flow of the Johnson-Segalman (JS) model with a diffusion term in various geometries and under controlled strain rate conditions, using matched asymptotic expansions. The diffusion term represents a singular perturbation that lifts the continuous degeneracy of stable, banded, steady states present in the absence of diffusion. We show that the stable steady flow solutions in Poiseuille and cylindrical Couette geometries always have two bands. For Couette flow and small curvature, two different banded solutions are possible, differing by the spatial sequence of the two bands.

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