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Herschel-Bulkley rheology from lattice kinetic theory of soft glassy materials

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Published 30 July 2010 Europhysics Letters Association
, , Citation R. Benzi et al 2010 EPL 91 14003 DOI 10.1209/0295-5075/91/14003

0295-5075/91/1/14003

Abstract

We provide clear evidence that a two-species mesoscopic Lattice Boltzmann (LB) model with competing, short-range attractive and mid-range repulsive, interactions supports emergent Herschel-Bulkley (HB) rheology, i.e. a power-law dependence of the shear stress as a function of the strain rate, beyond a given yield stress threshold. This kinetic formulation supports a seamless transition from flowing to non-flowing behaviour, through a smooth tuning of the parameters governing the mesoscopic interactions between the two species. The present model may become a valuable computational tool for the investigation of the rheology of soft glassy materials on scales of experimental interest.

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