Non-local stresses in highly non-uniformly flowing suspensions: The shear-curvature viscosity

Jin, H.; Dhont, J. K. G.; Ahn, K. H.; Briels, Willem; Kang, K.

doi:10.1063/1.5035268

Journal Article

FZJ-2018-03629

Non-local stresses in highly non-uniformly flowing suspensions: The shear-curvature viscosity

Jin, H.FZJ* ; Kang, K.FZJ* ; Ahn, K. H. ; Briels, W. (Corresponding author)FZJ* ; Dhont, J. K. G. (Corresponding author)FZJ*

2018
American Institute of Physics Woodbury, NY

The journal of chemical physics 149(1), 014903 (2018) [10.1063/1.5035268]

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Please use a persistent id in citations: http://hdl.handle.net/2128/20300 doi:10.1063/1.5035268

Abstract: For highly non-uniformly flowing fluids, there are contributions to the stress related to spatial variations of the shear rate, which are commonly referred to as non-local stresses. The standard expression for the shear stress, which states that the shear stress is proportional to the shear rate, is based on a formal expansion of the stress tensor with respect to spatial gradients in the flow velocity up to leading order. Such a leading order expansion is not able to describe fluids with very rapid spatial variations of the shear rate, like in micro-fluidics devices and in shear-banding suspensions. Spatial derivatives of the shear rate then significantly contribute to the stress. Such non-local stresses have so far been introduced on a phenomenological level. In particular, a formal gradient expansion of the stress tensor beyond the above mentioned leading order contribution leads to a phenomenological formulation of non-local stresses in terms of the so-called “shear-curvature viscosity”. We derive an expression for the shear-curvature viscosity for dilute suspensions of spherical colloids and propose an effective-medium approach to extend this result to concentrated suspensions. The validity of the effective-medium prediction is confirmed by Brownian dynamics simulations on highly non-uniformly flowing fluids.

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