In this work the possibility of obtaining a uniform withdrawal of initially segregated particles inside a hopper by using aeration was verified. To this end, experimentally measured solids velocity fields during the discharge from a two-dimensional hopper under aerated conditions were used to predict the composition of the discharged solids, starting from a bulk of binary solids ideally segregated with respect to the color property. The influence of aeration on the composition at the hopper outlet was assessed as a function of the aeration rate. The optimal aeration rate coincides with the minimum to obtain the discharge rate plateau value. Finally, the boundary profile dividing the two particles fractions during the hopper discharge was evaluated and compared with the experimental results.
The use of aeration to obtain uniform flows of fine particles during the discharge from a hopper loaded with segregated solids
BARLETTA, Diego;D'ARCO, ANNA;DONSI', Giorgio;FERRARI, Giovanna;POLETTO, Massimo
2004-01-01
Abstract
In this work the possibility of obtaining a uniform withdrawal of initially segregated particles inside a hopper by using aeration was verified. To this end, experimentally measured solids velocity fields during the discharge from a two-dimensional hopper under aerated conditions were used to predict the composition of the discharged solids, starting from a bulk of binary solids ideally segregated with respect to the color property. The influence of aeration on the composition at the hopper outlet was assessed as a function of the aeration rate. The optimal aeration rate coincides with the minimum to obtain the discharge rate plateau value. Finally, the boundary profile dividing the two particles fractions during the hopper discharge was evaluated and compared with the experimental results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
