Discrete particle simulation of size segregation of particle mixtures in a gas fluidized bed--颗粒学报PARTICUOLOGY

Feng, Y. Q., & Yu, A. B. (2006). Discrete particle simulation of size segregation of particle mixtures in a gas fluidized bed. China Particuology, 4(3), 122–126. https://doi.org/10.1016/S1672-2515(07)60250-4

Discrete particle simulation of size segregation of particle mixtures in a gas fluidized bed

Y.Q. Feng ^{a b}, A.B. Yu ^a *

a Center for Simulation and Modelling of Particulate Systems, School of Materials Science and Engineering, The University of New South Wales, Sydney NSW 2052, Australia
b Divisions of Minerals, Commonwealth Scientific and Industrial Research Organization, Box 312, Clayton South, Victoria 3169, Australia

10.1016/S1672-2515(07)60250-4

Volume 4, Issues 3–4, July 2006, Pages 122-126

Received 19 December 2005, Accepted 2 April 2006, Available online 27 November 2007.

E-mail: a.yu@unsw.edu.au

Highlights

Abstract

This paper presents a study of the mixing/segregation behaviour of particle mixtures in a gas fluidized bed by use of the discrete particle simulation. Spherical particles with diameters 2 mm (jetsam) and 1 mm (flotsam) and density 2 500 kg·m⁻³ are used as solid mixtures with different volume fractions. The particles are initially packed uniformly in a rectangular bed and then fluidized by gas uniformly injected at the bottom of the bed. The gas injection velocities vary to cover fixed, partially and fully fluidized bed conditions. Segregation/mixing behaviour is discussed in terms of flow patterns, solid concentration profile and mixing kinetics. The results show that segregation, as a transient fluidization process, is strongly affected by gas injection velocities for a given particle mixture. With the increase of the volume fraction of flotsam, size segregation appears at lower velocities.

Graphical abstract

Keywords

gas fluidization; segregation; discrete particle simulation

文章导读