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Rheology of dense granular suspensions: the transition from Newtonian to Bagnoldian rheology

Conf’luence Elisabeth Guazzelli

Université de Paris, CNRS, Matière et Systèmes Complexes (MSC) UMR 7057, Paris

Vendredi 18  mars à 10 h 30 – Amphithéâtre Nougaro

Abstract :

Dense granular suspensions that consist of concentrated mixtures of non-colloidal particles suspended in a liquid are ubiquitous in many natural phenomenon (landslides, debris flows, sediment transport) and industrial processes (concrete, pastes). Their rheology is not fully understood and establishing a unified theoretical framework across the different flowing regimes is still challenging. The present work describes precise rheological measurements of non-colloidal suspensions in the dense regime utilizing a unique custom-built rheometer able to perform pressure- and volume-imposed rheometry. It addresses the transition from a Newtonian rheology in the Stokes limit to a Bagnoldian rheology when inertia is increased and examines whether the inertial and viscous regimes can be unified as a function of a single dimensionless number based on stress additivity.
This work has been done in collaboration with Mie Ichihara, O. Pouliquen and F. Tapia.

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