Stress Chains Formation under Shear of Concentrated Suspension

Lootens, Didier; Martys, Nicos; George, William L.; Satterfield, Steven G.; Hébraud, Pascal

doi:10.1063/1.2964806

Cited by 2 publications

(1 citation statement)

References 7 publications

(10 reference statements)

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“…Notably, the high stress particles are almost all blue, corresponding to lower local volume fraction. In addition, they tend to form short chains in the compressive direction, which have been observed in previous simulations [40] and are highly reminiscent of the force chains in sheared granular materials [41]. In our simulations, these chains form and break up rapidly as particles rearrange due to Brownian fluctuations and shear motion.…”

Section: Impact On Stressessupporting

confidence: 79%

Ordered domains in sheared dense suspensions: the link to viscosity and the disruptive effect of friction

Goyal¹,

Gado²,

Jones³

et al. 2022

Preprint

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Monodisperse suspensions of Brownian colloidal spheres crystallize at high densities, and ordering under shear has been observed at densities below the crystallization threshold. We perform largescale simulations of a model suspension containing over 10 5 particles to quantitatively study the ordering under shear and to investigate its link to the rheological properties of the suspension. We find that at high rates, for P e > 1, the shear flow induces an ordering transition that significantly decreases the measured viscosity. This ordering is analyzed in terms of the development of layering and planar order, and we determine that particles are packed into hexagonal crystal layers (with numerous defects) that slide past each other. By computing local ψ6 and ψ4 order parameters, we determine that the defects correspond to chains of particles in a square-like lattice. We compute the individual particle contributions to the stress tensor and discover that the largest contributors to the shear stress are primarily located in these lower density, defect regions. The defect structure enables the formation of compressed chains of particles to resist the shear, but these chains are transient and short-lived. The inclusion of a contact friction force allows the stress-bearing structures to grow into a system-spanning network, thereby disrupting the order and drastically increasing the suspension viscosity.

show abstract

Section: Impact On Stressessupporting

confidence: 79%

Ordered domains in sheared dense suspensions: the link to viscosity and the disruptive effect of friction

Goyal¹,

Gado²,

Jones³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Ordered domains in sheared dense suspensions: The link to viscosity and the disruptive effect of friction

Goyal

Gado

Jones

et al. 2022

Journal of Rheology

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Monodisperse suspensions of Brownian colloidal spheres crystallize at high densities, and ordering under shear has been observed at densities below the crystallization threshold. We perform large-scale simulations of a model suspension containing over [Formula: see text] particles to quantitatively study the ordering under shear and to investigate its link to the rheological properties of the suspension. We find that at high rates, for [Formula: see text], the shear flow induces an ordering transition that significantly decreases the measured viscosity. This ordering is analyzed in terms of the development of layering and planar order, and we determine that particles are packed into hexagonal crystal layers (with numerous defects) that slide past each other. By computing local [Formula: see text] and [Formula: see text] order parameters, we determine that the defects correspond to chains of particles in a squarelike lattice. We compute the individual particle contributions to the stress tensor and discover that the largest contributors to the shear stress are primarily located in these lower density, defect regions. The defect structure enables the formation of compressed chains of particles to resist the shear, but these chains are transient and short-lived. The inclusion of a contact friction force allows the stress-bearing structures to grow into a system-spanning network, thereby disrupting the order and drastically increasing the suspension viscosity.

show abstract

Stress Chains Formation under Shear of Concentrated Suspension

Cited by 2 publications

References 7 publications

Ordered domains in sheared dense suspensions: the link to viscosity and the disruptive effect of friction

Ordered domains in sheared dense suspensions: the link to viscosity and the disruptive effect of friction

Ordered domains in sheared dense suspensions: The link to viscosity and the disruptive effect of friction

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