Discrete and continuum modeling of granular flow in silo discharge  

作　　者：Tian Tian Jinglin Su Jinhui Zhan Shujun Geng Guangwen Xu Xiaoxing Liu 

机构地区：[1]State Key Laboratory of Multi-Phase Complex System, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China [2]University of Chinese Academy ofSdences, Beijing 100049, China [3]Sino-Danish Center for Education and Research, Beijing 100190, China

出　　处：《Particuology》2018年第1期127-138,共12页颗粒学报（英文版）

基　　金：This work is supported financially by the National Natural Science Foundation of China, grant No. 21576265. Xiaoxing Liu acknowledges the financial support from the Hundred Talents Pro- gram of Chinese Academy of Sciences.

摘　　要：Granular material discharge from a flat-bottomed silo has been simulated by using continuum modeling and a three-dimensional discrete-element method （DEM）. The predictive abilities of three commonly used frictional viscosity models （Schaeffer, S-S, and μ（I）） were evaluated by comparing them with the DEM data. The funnel-flow pattern （type C） and the semi-mass-flow pattern （type B） that was predicted by DEM simulations can be represented when the Schaeffer orμ（I） model is used, whereas the S-S model gives a consistent type-B flow pattern. All three models over-estimate the discharge rate compared with the DEM. The profiles of the solids volume fraction and the vertical velocity above the outlet show that the larger discharge rates given by the Schaeffer and μ（I） model result from an over-estimation of volume fraction, whereas the deviation in the S-S model stems from the failure to predict a solid vertical velocity and a volume fraction.Granular material discharge from a flat-bottomed silo has been simulated by using continuum modeling and a three-dimensional discrete-element method （DEM）. The predictive abilities of three commonly used frictional viscosity models （Schaeffer, S-S, and μ（I）） were evaluated by comparing them with the DEM data. The funnel-flow pattern （type C） and the semi-mass-flow pattern （type B） that was predicted by DEM simulations can be represented when the Schaeffer orμ（I） model is used, whereas the S-S model gives a consistent type-B flow pattern. All three models over-estimate the discharge rate compared with the DEM. The profiles of the solids volume fraction and the vertical velocity above the outlet show that the larger discharge rates given by the Schaeffer and μ（I） model result from an over-estimation of volume fraction, whereas the deviation in the S-S model stems from the failure to predict a solid vertical velocity and a volume fraction.

关 键 词：SILO Flow pattern Discharge rate Discrete-element model Frictional viscosity model 

分 类 号：O189.1[理学—数学] TU-024[理学—基础数学]