Talk (non-conference) (Invited)

FZJ-2015-01112

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Flow Instabilities due to Shear-Gradients with Concentration

Kang, K. (Corresponding Author)FZJ*

2014

Abstract: Shear-induced flow instabilities is the instability of the shear-gradient concentration coupling (SCC)-instability due to coupling of shear-gradient induced mass transport and concentration [1, 2]. This leads to a self-amplifying increase of spatial gradients of the shear rate, provided that the viscosity is sufficiently strong depending on the concentration. The origin of the shear-gradient induced mass flux will be discussed, as well as the stationary flow- and concentration-profiles for the systems of yield stress (glassy) hard-spheres [3].[1] J.K.G. Dhont, K. Kang, M.P. Lettinga, W.J. Briels, “Shear banding instabilities”, KOR-AUS Rheology Journal 22, 291-308, 2010.[2] V. Schmitt, C. M. Marques, F. Lequeux, “Shear-induced phase separation of complex fluids: The role of flow-concentration coupling”, Phys. Rev. E. 52, 4009-4015, 1995.[3] H. Jin, K. Kang, K-H, Ahn, J.K.G. Dhont, „Flow instability due to coupling of shear-gradients with concentration: non-uniform flow of hard sphere glasses”, Soft Matter, Doi: 10.1039/c4sm01329h, 2014.

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. 451 - Soft Matter Composites (POF2-451) (POF2-451)

Appears in the scientific report 2015

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