Abstract
In the aim to understand the thermo-mechanical phenomenology of the dry granular media due to the grains’ flow nature of (rheology) or particles that constitute this medium. We will illustrate in this present article a numerical study by the discrete elements (MED) method on the thermo-mechanical behavior of a set of rigid particles sheared in an annular cell. This study is focused on the modeling of local friction between particles, from the generation of heat and its diffusion by conduction. We realized out a two-dimensional (2D) numerical model of type Couette geometry to simulate the different thermo-mechanical quantities such as: flow velocity and media temperature. This modeling is implemented within the platform used LMGC90, which is based on the NSCD (Non-Smooth Contact Dynamics Method) approach. In the First time, we’ll study the various realistic physical quantities of the contact’s rheology (type of particles material, the applied pressure and the shear velocity). Then we will continue by the analytical analysis and interpretation of the obtained results. DOI: http://dx.doi.org/10.5755/j01.mech.24.6.22461
Highlights
The study of granular media is of particular interest for the researches in a many scientific fields: physics, mechanics, geophysics, chemistry...The flow of the solid particles which constitute this medium under different operational conditions, carry to a multitude of different behaviors
In light of the resolution of the local problem of frictional contact due to dry annular shear where particle shear is indefinite and the rate is high, recent studies have shown that operating conditions play a crucial role in the dynamic properties of granular flows under this type of shear
In agreement with the experimental observations, they showed that the evolution of the effective friction of the material to the wall depends on the roughness of the inner cylinder
Summary
The study of granular media is of particular interest for the researches in a many scientific fields: physics, mechanics, geophysics, chemistry...The flow of the solid particles which constitute this medium under different operational conditions, carry to a multitude of different behaviors. Shunying and al [4] realized a direct comparison between the experimental and numerical results by the method of the discrete elements of the sheared materials at different speeds of rotation and pressures. They found that not all the relative particle-level information, such as rigidity, grain size distribution, and damping, is important for simulating the shear response. To complete the mechanical response of the particles during annular shear as well as the difficulties of the experimental realization of the thermal study, we will carry out in this work a 2D numerical study on the thermomechanical behavior of a granular medium in an annular shear cell at shear rate and confining pressure imposed. We will finish with a conclusion in the section 4
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