Abstract
The behaviour of wet granular media in shear flow is characterized by the dependence of apparent friction μ * and solid fraction Φs on the reduced pressure P * and the inertia number I . Reduced pressure, P * = σ22 a 2 /F 0 , compares the applied normal stress σ22 on grains of diameter a to the tensile strength of contact F 0 (proportional to the surface tension Г of the liquid and the beads diameter). A specifically modified rotational rheometer is used to characterize the response of model wet granular material to applied shear rate under controlled normal stress σ22 . Discrete Element Method (DEM) simulations in 3D are carried out in parallel and numerical results are compared with experimental ones. Cohesive, inertia, saturation and viscous effects on macroscopic coefficient of friction μ * and solid fraction Φs are discussed.
Highlights
In the steady state, shear flows of granular materials under controlled normal stress σ22 and shear rate γ are well described by the solid fraction ΦS and the macroscopic friction coefficient μ∗ = σ12/σ22
Recent studies showed that in the case of wet granular materials there is a strong dependency of both μ∗ and ΦS on the cohesive effect induced by liquid bonding between particles [3,4,5]
The aim of the present commuication is to compare these Discrete Element Method (DEM) simulations of wet grain assemblies with new experimental measurements using a normal stress controlled shear cell, both in the quasistatic limit and in dense inertial flows
Summary
Characterizing flow ine√rtia of such materials with the inertial number I = γa m/aσ (m being the mass of a grain and a its diameter) is a classical approach [1, 2]. Recent studies showed that in the case of wet granular materials there is a strong dependency of both μ∗ and ΦS on the cohesive effect induced by liquid bonding between particles [3,4,5]. The aim of the present commuication is to compare these DEM simulations of wet grain assemblies with new experimental measurements using a normal stress controlled shear cell, both in the quasistatic limit and in dense inertial flows.
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