ARSHAD, Muhammad; MAALI, Abdelhamid; CLAUDET, Cyrille; LOBRY, Laurent; PETERS, Francois; LEMAIRE, Elisabeth

doi:10.1039/D1SM00254F

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ARSHAD, Muhammad
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

MAALI, Abdelhamid
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

CLAUDET, Cyrille
Institut de Physique de Nice [INPHYNI]

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Article de revue

Ce document a été publié dans

Soft Matter. 2021-06-30, vol. 17, n° 25, p. 6088-6097

Royal Society of Chemistry

Résumé en anglais

This paper focuses on shear-thinning in non-Brownian suspensions. In particular, it proposes a quantitative experimental validation of the model proposed by Lobry et al. [J. Fluid Mech., 2019, 860, 682-710] that links viscosity to microscopic friction between particles and, in particular, shear-thinning to load-dependent friction coefficient. To this aim, Atomic Force Microscopy (AFM) is used to measure the pairwise friction coefficient of polystyrene particles (40 μm in diameter), immersed in a Newtonian liquid, for different normal loads ranging from 10 to 1000 nN. It is shown that the inter-particle friction coefficient decreases with the load, contrarily to what is expected for macroscopic contacting bodies. The experimental friction law is then introduced into the viscosity model proposed by Lobry et al. and the results are compared to the viscosity of suspensions madeof the same particles dispersed in the same liquid as those used for AFM measurements. The very good agreement between the measured viscosity values and those predicted by the model of Lobry et al. with the friction coefficient measured by AFM as input data shows the relevance of the scenario proposed by Lobry et al. and highlights the close links between the microscopic friction properties of the particles and the macroscopic rheological behavior of suspensions.< Réduire

DOI

http://dx.doi.org/10.1039/D1SM00254F

Project ANR

Approche multidisciplinaire pour la construction d'un outil prédictif en rhéologie des suspensions non-Browniennes - ANR-18-CE06-0009

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Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798