Multi-level DEM study on silo discharge behaviors of non-spherical particles |
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Institution: | 1. College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China;2. College of Mechanical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China |
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Abstract: | The silo discharge of non-spherical particles has been widely practiced in engineering processes, yet the understanding of multi-level mechanisms during solid transportation is still lacking. In this study, a high-fidelity super-ellipsoid Discrete Element Method (DEM) model is established to investigate the discharge behaviors of non-spherical particles with different size distributions. After the comprehensive model validations, we investigated the effects of particle shape (aspect ratio and particle sharpness) on the particle level discharge behaviors. The discharge rates of the ellipsoid particles used in the current work are larger than the spherical particles due to the larger solid fraction. The discharge rates of the cuboid-like particles are determined by the combined effect of the solid fraction and the contact force. Parcel level data show that the translational movements of the ellipsoid particles are more ordered, which is supported by the global level data. Strong correlations exist between the particle level and parcel level data, especially the ellipsoid particles and the large particles in the polydispersed cases. |
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Keywords: | Multi-level study Non-spherical particle Numerical simulation Silo discharge Granular flow |
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