Three-dimensional multi-phase simulation of the mixing and segregation of binary particle mixtures in a two-jet spout fluidized bed--颗粒学报PARTICUOLOGY

Wang, X., Jin, B., Wang, Y., & Hu, C. (2015). Three-dimensional multi-phase simulation of the mixing and segregation of binary particle mixtures in a two-jet spout fluidized bed. Particuology, 22, 185-193. https://doi.org/10.1016/j.partic.2014.12.013

Three-dimensional multi-phase simulation of the mixing and segregation of binary particle mixtures in a two-jet spout fluidized bed

Xiaojia Wang, Baosheng Jin ^*, Yanyan Wang, Chunhong Hu

Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy & Environment, Southeast University, Nanjing 210096, China

10.1016/j.partic.2014.12.013

Volume 22, October 2015, Pages 185-193

Received 25 June 2014, Revised 14 September 2014, Accepted 18 December 2014, Available online 6 June 2015, Version of Record 4 August 2015.

E-mail: bsjin@seu.edu.cn

Highlights

• A three-fluid model was developed to investigate hydrodynamics in a two-jet spout fluidized bed.

• Simulations were performed in three-dimensional domains.

• Mixing and segregation mechanism for binary particle mixtures was analyzed.

Abstract

This study presents a three-dimensional numerical study of the mixing and segregation of binary particle mixtures in a two-jet spout fluidized bed based on an Eulerian–Eulerian three-fluid model. Initially, the particle mixtures were premixed and packed in a rectangular fluidized bed. As the calculation began, the gas stream was injected into the bed from the distributor and jet nozzles. The model was validated by comparing the simulated jet penetration depths with corresponding experimental data. The main features of the complex gas–solid flow behaviors and the mechanism of mixing and segregation of the binary mixtures were analyzed. Moreover, further simulations were carried out to evaluate the effects of operating conditions on the mixing and segregation of binary particle mixtures. The results illustrate that mixing can be enhanced by increasing the jet velocity or enlarging the difference of initial proportions of binary particle mixtures.

Graphical abstract

Keywords

Fluidized bed; Binary particle mixture; Mixing; Segregation; Numerical simulation; Three-fluid model

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