XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1141
discontinuity in obtaining the mass discharge rate. To rec-
tify this and to reconstruct the mass discharge (%)curve,
the mass discharge pattern after arching was identified and
the results were extrapolated using polynomial extrapola-
tion to get the continuous data for discharge pattern for the
initial time period before the particles got jammed inside
the hopper.
The comparison of the mass discharge %curve for the
cube shaped particles between the experimental and the
DEM simulations is shown in Figure 7. It was observed
that the polyhedral DEM simulations took the longer
time to discharge the particles while the multi-sphere
DEM simulations discharged the particles faster. Initially
the polyhedral DEM overpredicted the discharge rate by
10.58%, whereas at the later stage the polyhedral DEM
underpredicted the discharge rate by 10.79%. The multi-
sphere-based DEM over-predicted the experimental results
by 19.21%. The velocity contours for the cube discharge
studies are given in Figure 8. The flow pattern inside the
hopper was found as the funnel flow with less stagnant
zones in experimental study than from the multi-sphere
Figure 6. (a) Arching observed during the discharge of cubic particles from the hopper (b) Flow inside the hopper at different
time using experimental and DEM simulations
Figure 7. Mass discharge %vs time for cubes discharge from
the hopper
discontinuity in obtaining the mass discharge rate. To rec-
tify this and to reconstruct the mass discharge (%)curve,
the mass discharge pattern after arching was identified and
the results were extrapolated using polynomial extrapola-
tion to get the continuous data for discharge pattern for the
initial time period before the particles got jammed inside
the hopper.
The comparison of the mass discharge %curve for the
cube shaped particles between the experimental and the
DEM simulations is shown in Figure 7. It was observed
that the polyhedral DEM simulations took the longer
time to discharge the particles while the multi-sphere
DEM simulations discharged the particles faster. Initially
the polyhedral DEM overpredicted the discharge rate by
10.58%, whereas at the later stage the polyhedral DEM
underpredicted the discharge rate by 10.79%. The multi-
sphere-based DEM over-predicted the experimental results
by 19.21%. The velocity contours for the cube discharge
studies are given in Figure 8. The flow pattern inside the
hopper was found as the funnel flow with less stagnant
zones in experimental study than from the multi-sphere
Figure 6. (a) Arching observed during the discharge of cubic particles from the hopper (b) Flow inside the hopper at different
time using experimental and DEM simulations
Figure 7. Mass discharge %vs time for cubes discharge from
the hopper