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Internal relaxation time in immersed particulate materials

By Pierre Rognon, Itai Einav and Cyprien Gay

Abstract

International audienceWe study the dynamics of the solid to liquid transition for a model material made of elastic particles immersed in a viscous fluid. The interaction between particle surfaces includes their viscous lubrication, a sharp repulsion when they get closer than a tuned steric length and their elastic deflection induced by those two forces. We use Soft Dynamics to simulate the dynamics of this material when it experiences a step increase in the shear stress and a constant normal stress. We observe a long creep phase before a substantial flow eventually establishes. We find that the typical creep time relies on an internal relaxation process, namely the separation of two particles driven by the applied stress and resisted by the viscous friction. This mechanism should be relevant for granular pastes, living cells, emulsions and wet foams

Topics: dilatancy, friction law, viscosity, Soft Dynamics, shear, Dense suspension, 83.80.Fg, 47.57.Gc, 83.80.Hj, 82.70.Kj, [ PHYS.COND.CM-SCM ] Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], [ PHYS.PHYS.PHYS-FLU-DYN ] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [ PHYS.MECA.MEFL ] Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph], [ SPI.MECA.MEFL ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], [ PHYS.PHYS.PHYS-COMP-PH ] Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph]
Publisher: American Physical Society
Year: 2010
DOI identifier: 10.1103/PhysRevE.81.061304
OAI identifier: oai:HAL:hal-00549405v1
Provided by: Hal-Diderot
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