DEM simulation of polydisperse systems of particles in a fluidized bed

查看全文 作　　者：Nobuyuki [1]Tagami;Ajit [1]Mujumdar;Masayuki [1]Horio

机构地区：[1]Bio Applications and Systems Engineering,Tokyo University of Agriculture & Technology,Naka-cho,Koganei-shi,Tokyo 184-8588,Japan

出　　处：《Particuology》索引2009年第7卷第1期,共10页

基　　金：support from Japanese Society for Promotion of Science (JSPS) for conducting this research work 摘　　要：Numerical simulations based on three-dimensional discrete element model (DEM) are conducted for mono-disperse, binary and ternary systems of particles in a fluidized bed. Fluid drag force acting on each particle depending on its size and relative velocity is assigned. The drag coefficient corresponding to Ergun’s correlation is applied to the system of fluidized bed with particle size ratios of 1:1 for the mono-disperse system, 1:1.2, 1:1.4 and 1:2 for the binary system and 1:1.33:2 for the ternary system by keeping total volume and surface area of the particles constant. Results indicated that a reasonable estimation of drag force based on individual particle diameters as compared to that of the mean diameter of the particles is achieved in the fluid cells. The total translational kinetic energy of the particles is found to increase as the particle size ratio increases, suggesting an enhanced momentum transfer in polydisperse particle systems. Systems with wide particle size distribution exhibited higher particle velocities around bubbles, resulting in faster bubble growth and its subsequent rise through the fluidized bed. 关键词：粒子系统分散系统流化床模型模拟数字高程离散单元模型平均粒径相对速度

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DEM simulation of polydisperse systems of particles in a fluidized bed

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