Multi-level DEM study on silo discharge behaviors of non-spherical particles  

作　　者：Lei Xu Xiukai Wu Jingyin Liang Shuai Wang Shiyi Bao 

机构地区：[1]Institute of Process Equipment and Control Engineering,College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou,310032,China [2]Engineering Research Center of Process Equipment and Remanufacturing,Ministry of Education,China [3]State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou,310027,China

出　　处：《Particuology》2023年第11期179-191,共13页颗粒学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(grant No.52075489 and 52205172);Zhejiang Province Public Welfare Technology Application Research Project(grant No.LGG20E050017);the Natural Science Foundation of Zhejiang Province of China(grant No.LY23E050015).

摘　　要：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.

关 键 词：Multi-level study Non-spherical particle Numerical simulation Silo discharge Granular flow 

分 类 号：O413.1[理学—理论物理]