Arch formation mechanism and discharge process of cohesive fine powder in a vibrated silo  

作　　者：Jingzhen Zhu Kun Wang Yu Ma Wentao Xu Jiecai Long Xiwen Li 

机构地区：[1]State Key Laboratory of Digital Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan,430074,China [2]School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China [3]State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment,Guangdong University of Technology,Guangzhou,510006,China

出　　处：《Particuology》2024年第11期373-385,共13页颗粒学报（英文版）

摘　　要：The arch formation mechanism and discharge process of a very cohesive fine powder(calcium carbonate)in a vibrated silo was investigated by experiments and discrete element method(DEM)simulations.An experimental setup is built to study the flow behaviors with the proposed image-based flow rate measurement method.A cohesive DEM model is used to investigate the dynamic behaviors of the powder bed.Results indicate that the arch formation depends on the vibration acceleration amplitude and is slightly affected by the frequency.The powder discharge flow rate increases with vibration acceleration amplitude and decreases with frequency.When the acceleration amplitude exceeds 15 g,the flow rate tends to stabilize.When the acceleration amplitude exceeds 1 g,there is separation and collision between the powder bed and the silo bottom.This collision leads to a significant increase in the contact force.

关 键 词：Cohesive fine powder Silo discharge Vertical vibration Arch formation Flow rate Discrete element method 

分 类 号：TG14[一般工业技术—材料科学与工程]