The influence of surface roughness on the rheology of immersed and dry frictional spheres

Abstract

Pressure-imposed rheometry is used to examine the influence of surface roughness on the rheology of immersed and dry frictional spheres in the dense regime. The quasi-static value of the effective friction coefficient is not significantly affected by particle roughness while the critical volume fraction at jamming decreases with increasing roughness. These values are found to be similar in immersed and dry conditions. Rescaling the volume fraction by the maximum volume fraction leads to collapses of rheological data on master curves. The asymptotic behaviors are examined close to the jamming transition.

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• Deposition of a particle-laden film on the inner wall of a tube
• Integration through transients approach to the $\mu (\mathcal{I})$ rheology
• Getting jammed in all directions: Dynamic shear jamming around a cylinder towed through a dense suspension
• Rheology of granular liquids in extensional flows: Beyond the $\mu (\mathcal{I})$-law
• Probing dissipation in spreading drops with granular suspensions
• Non-monotonic constitutive curves and shear banding in dry and wet granular flows
• Vane rheology of a fiber-reinforced granular material
• Characterizing the surface texture of a dense suspension undergoing dynamic jamming
• Granular aqueous suspensions with controlled inter-particular friction and adhesion