2D simulation of density-induced segregation during die filling in the presence of air
In this study, the segregation of binary granular mixtures with the same particle size but different densities during die filling in the presence of air was investigated using a combined discrete element method (DEM) and computational fluid dynamics (CFD) approach, in which the particles were modelled using DEM, the air was analysed using CFD and a two-way coupling of the particles and the air was incorporated. Die fillings from stationary and moving shoes into the dies with different sizes were simulated and the corresponding segregations were analyzed. It has been found that, after the die filling from a stationary shoe,the concentration distributions of the heavy and light particles along the die width mainly depend on the initial packing of the granular mixture in the shoe, but for die filling from a moving shoe, a low concentration of light particles on the leading side of the die (referred to the direction of the shoe motion) is observed for the die filling with a square die. The density difference always causes segregation along the die depth with a low concentration of light particles at the bottom. The presence of air augments the degree of this segregation by resisting the flow of light particles into the bottom of the die and leading to a higher concentration of the light particles at the top.
Density-induced segregation the effect of air DEM CFD die filling
Y.Guo K.D.Kafui C.Thornton C.Y.Wu
Department of Chemical Engineering,University of Birmingham,Edgbaston,Birmingham,B15 2TT,UK
国际会议
北京
英文
268-277
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）