Vibration induced flow in hoppers: DEM 2D polygon model |
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Authors: | Feras Y Fraige Paul A Langston Andrew J Matchett John Dodds |
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Institution: | aFaculty of Mining and Environmental Engineering, Al-Hussein Bin Talal University Jordan, Ma’an, P.O. Box 20, Jordan;bChemical and Environmental Engineering, Nottingham University, University Park, Nottingham NG7 2RD, UK;cChemical Engineering, University of Teesside, Middlesbrough TS1 3BA, UK;dCentre RAPSODEE, Ecole Des Mines, Campus Jarland-81013 Albi, France |
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Abstract: | A two-dimensional discrete element model (DEM) simulation of cohesive polygonal particles has been developed to assess the benefit of point source vibration to induce flow in wedge-shaped hoppers. The particle–particle interaction model used is based on a multi-contact principle.The first part of the study investigated particle discharge under gravity without vibration to determine the critical orifice size (Bc) to just sustain flow as a function of particle shape. It is shown that polygonal-shaped particles need a larger orifice than circular particles. It is also shown that Bc decreases as the number of particle vertices increases. Addition of circular particles promotes flow of polygons in a linear manner.The second part of the study showed that vibration could enhance flow, effectively reducing Bc. The model demonstrated the importance of vibrator location (height), consistent with previous continuum model results, and vibration amplitude in enhancing flow. |
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Keywords: | Bulk solids Vibration DEM Hoppers Materials handling Polygon |
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