Parametric evaluation for powder flowability using a freeman rheometer: a discrete element method study
Document typeConference report
Rights accessOpen Access
A discrete element method (DEM) using the Hertz-Mindlin and JKR models was used to model the flowability measurement on a cohesive particulate material in the Freeman FT4 powder rheometer. An assessment of DEM parameterswas carried out to understand the operation of this equipment and to study the correlation between inter-particle properties and flowability. Simulation results indicate that the static and rolling friction coefficients, and JKR cohesion energy density are all negatively correlated with powder flowability, meaning that an increase in any of these parameters results in a decrease in powder flowability. At higher level friction, the force and torque have a larger measurement deviation, which is possibly due to local jamming in the particle bed. The powder flowability decreases as particle size increases for the current coarse grained system. Particles size distribution width has very little effect on the flowability changes. Particles with lower sphericity tend to have lower flowability possibly due to particle interlocking. It was demonstrated that rolling friction has a large effect on flowability for a give non-spherical particle shape.
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