Journal
POWDER TECHNOLOGY
Volume 274, Issue -, Pages 482-493Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2015.01.046
Keywords
Bubbling fluidized bed; Discrete element method; Particle mixing; Particle dispersion; Multiphase flow
Categories
Funding
- National Natural Science Foundation of China [51390493, 51390491, 51276164]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities
Ask authors/readers for more resources
Three-dimensionally coupled computational fluid dynamics (CFD) and discrete element method (DEM) are used to investigate the gas-solid hydrodynamics and mixing characteristics of a three-dimensional rectangular bubbling fluidized bed. The numerical study is conducted referring to the quasi-3D experimental apparatus investigated by Goldschmidt et al. [1]. The simulation results turn out that time-averaged solid volume fraction and instantaneous particle height agree well with the experimental data. To investigate the solid behavior, the solid velocity and flux distribution are extracted and the influence of the gas velocity on the solid velocity is discussed. It is found that higher gas velocity induces the formation of double-recirculation pattern in which solid phase mainly moves from the near wall region to the central region in the lower bed and oppositely in the upper bed. At the same time, the solid mixing is faster under higher inlet velocity, and that particles in vertical directions tend to mix better than those in lateral directions. At last, we find the particle dispersion coefficient is very anisotropic in three normal directions. In accordance with the results of most experiments, the geometry structure strongly influenced the coefficient value. We also find when inlet gas velocity is higher, the dispersion coefficient increases, for the particle velocities are higher due to greater momentum exchange. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available