The rheology of concentrated suspensions of particles is complex and typically exhibits a shear-thickening behavior in the case of repulsive interactions. Despite the recent interest arisen, the causes of the shear-thickening remain unclear. Frictional contacts have been able to explain the discontinuous shear thickening in simulations. However, the interparticle friction coefficient is considered to be constant in most simulations and theoretical works reported to date despite the fact that tribological experiments demonstrate that the friction coefficient can not only be constant (boundary regime) but also decrease (mixed regime) or even increase (full-film lubrication regime), depending on the normal force and the relative velocity between the particles and the interstitial liquid between them. Interestingly, the transition between the boundary regime and the full-lubrication regime is governed by the particle average roughness. Particle-level simulations of suspensions of hard spheres were carried out using short-range lubrication and roughness-dependent frictional forces describing the full Stribeck curve. Suspensions with different particle’s roughness were simulated to show that the particle roughness is a key factor in the shear-thickening behavior; for sufficiently rough particles, the suspension exhibits a remarkable shear-thickening, while for sufficiently smooth particles, the discontinuous shear-thickening disappears.
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March 2023
Research Article|
March 01 2023
Tribological variable-friction coefficient models for the simulation of dense suspensions of rough polydisperse particles
Jose A. Ruiz-Lopez
;
Jose A. Ruiz-Lopez
a)
1
F2N2Lab, Magnetic Soft Matter Group and Excellence Research Unit “Modeling Nature” (MNat), Department of Applied Physics, Faculty of Sciences, University of Granada
, Fuentenueva s/n, 18071 Granada, Spain
a)Author to whom correspondence should be addressed; electronic mail: jantonio@ugr.es
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Sagaya S. Prasanna Kumar
;
Sagaya S. Prasanna Kumar
2
Basque Center for Applied Mathematics (BCAM)
, Alameda de Mazarredo 14, 48009 Bilbao, Spain
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Adolfo Vazquez-Quesada
;
Adolfo Vazquez-Quesada
3
Departamento de Física Fundamental, UNED
, Apartado 60141, 28080 Madrid, Spain
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Juan de Vicente
;
Juan de Vicente
1
F2N2Lab, Magnetic Soft Matter Group and Excellence Research Unit “Modeling Nature” (MNat), Department of Applied Physics, Faculty of Sciences, University of Granada
, Fuentenueva s/n, 18071 Granada, Spain
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Marco Ellero
Marco Ellero
2
Basque Center for Applied Mathematics (BCAM)
, Alameda de Mazarredo 14, 48009 Bilbao, Spain
4
IKERBASQUE, Basque Foundation for Science
, Calle de María Díaz de Haro 3, 48013 Bilbao, Spain
5
Zienkiewicz Centre for Computational Engineering (ZCCE), Swansea University
, Swansea SA1 8EN, United Kingdom
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a)Author to whom correspondence should be addressed; electronic mail: jantonio@ugr.es
J. Rheol. 67, 541–558 (2023)
Article history
Received:
May 31 2022
Accepted:
November 28 2022
Citation
Jose A. Ruiz-Lopez, Sagaya S. Prasanna Kumar, Adolfo Vazquez-Quesada, Juan de Vicente, Marco Ellero; Tribological variable-friction coefficient models for the simulation of dense suspensions of rough polydisperse particles. J. Rheol. 1 March 2023; 67 (2): 541–558. https://doi.org/10.1122/8.0000514
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