EPJ Web Conf.
Volume 140, 2017Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Section||Fluids and particles|
|Published online||30 June 2017|
Dilute suspensions in annular shear flow under gravity: simulation and experiment
1 Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany
2 Institute for Thermo and Fluid Dynamics - Hydraulic Fluid Machinery, Ruhr-University Bochum, Germany
3 Institute for Combustion and Gas Dynamics - Fluid Dynamics and CENIDE, University of Duisburg-Essen, Duisburg, Germany
* e-mail: email@example.com
Published online: 30 June 2017
A dilute suspension in annular shear flow under gravity was simulated using multi-particle collision dynamics (MPC) and compared to experimental data. The focus of the analysis is the local particle velocity and density distribution under the influence of the rotational and gravitational forces. The results are further supported by a deterministic approximation of a single-particle trajectory and OpenFOAM CFD estimations of the overcritical frequency range. Good qualitative agreement is observed for single-particle trajectories between the statistical mean of MPC simulations and the deterministic approximation. Wall contact and detachment however occur earlier in the MPC simulation, which can be explained by the inherent thermal noise of the method. The multi-particle system is investigated at the point of highest particle accumulation that is found at 2/3 of the particle revolution, starting from the top of the annular gap. The combination of shear flow and a slowly rotating volumetric force leads to strong local accumulation in this section that increases the particle volume fraction from overall 0.7% to 4.7% at the outer boundary. MPC simulations and experimental observations agree well in terms of particle distribution and a close to linear velocity profile in radial direction.
© The Authors, published by EDP Sciences, 2017
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