Radial mixing and segregation of granular bed bi-dispersed both in particle size and density within horizontal rotating drum

作     者：陈辉 赵先琼 肖友刚 刘义伦 刘颖 Hui CHEN;Xian-qiong ZHAO;You-gang XIAO;Yi-lun LIU;Ying LIU

作者机构：中南大学机电工程学院高性能复杂制造国家重点实验室长沙410083 中南大学交通运输工程学院长沙410075 中南大学建筑与艺术学院长沙410083 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第2期

页      面：527-535页

核心收录：

学科分类：080706[工学-化工过程机械] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Projects(51374241 51275531)supported by the National Natural Science Foundation of China Project(CX2014B059)supported by the Innovation Foundation for Postgraduate of Hunan Province,China 

主　　题：binary granular bed rotating drum solid particle radial mixing segregation discrete element method 

摘      要：Taking simultaneous variations in both particle volume and density into account, the radial mixing and segregation of binary granular bed in a rotating drum half loaded were investigated by a 3D discrete element method. Then, based on the competition theory of condensation and percolation, radial segregation due to differences in particle volume and/or density was analyzed. The results show that if either percolation effect induced by volume difference or condensation effect induced by density difference dominates in the active layer of moving bed, separation will occur. Controlling the volume ratio or density ratio of the two types of particles can achieve an equilibrium state between percolation and condensation, and then homogenous mixture can be obtained. When the percolation balances with the condensation, the relationship between volume ratioand density ratiopresents nearly a power function. Scaling up a rotating drum will not affect the mixing degree of the granular bed so long as the volume ratio and density ratio are predefined.