DEM simulation of polydisperse systems of particles in a fluidized bed--颗粒学报PARTICUOLOGY

Tagami, N., Mujumdar, A., & Horio, M. (2009). DEM simulation of polydisperse systems of particles in a fluidized bed. Particuology, 7(1), 9–18. https://doi.org/10.1016/j.partic.2008.11.008

DEM simulation of polydisperse systems of particles in a fluidized bed

Nobuyuki Tagami, Ajit Mujumdar^*, Masayuki Horio

Bio Applications and Systems Engineering, Tokyo University of Agriculture & Technology, Naka-cho, Koganei-shi, Tokyo 184-8588, Japan

10.1016/j.partic.2008.11.008

Volume 7, Issue 1, 18 February 2009, Pages 9-18

Received 7 August 2008, Accepted 11 November 2008, Available online 13 January 2009.

E-mail: ajitmujumdar@gmail.com

Highlights

Abstract

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.

Graphical abstract

Keywords

Discrete element method; Fluid drag force; Fluidized bed; Particle size distribution

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