Analysis of the velocity field of granular hopper flow
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We report the analysis of radial characteristics of the flow of granular material through a conical hopper. The discharge is simulated for various orifice sizes and hopper opening angles. Velocity profiles are measured along two radial lines from the hopper cone vertex: along the main axis of the cone and along its wall. An approximate power law dependence on the distance from the orifice is observed for both profiles, although differences between them can be noted. In order to quantify these differences, we propose a Local Mass Flow Index that is a promising tool in the direction of a more reliable classification of the flow regimes in hoppers.
KeywordsGranular matter Discrete element method Velocity profile Hopper flow
FGRM would like to thank Alessandro Leonardi for helpful discussions, as well as the whole Computational Physics Group at ETH Zürich for the hospitality and resources.
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Conflict of interest
This project was partially funded by Grant No. FP7-319968-FlowCCS of the European Research Council (ERC) Advanced Grant and Brazilian agencies CAPES, CNPq and Ciências sem Fronteiras. The authors declare that they have no conflict of interest.
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