Euler-Euler CFD modeling of fluidized bed: Influence of specularity coefficient on hydrodynamic behavior--颗粒学报PARTICUOLOGY

Loha, C., Chattopadhyay, H., & Chatterjee, P. K. (2013). Euler-Euler CFD modeling of fluidized bed: Influence of specularity coefficient on hydrodynamic behavior. Particuology, 11(6), 673–680. https://doi.org/10.1016/j.partic.2012.08.007

Euler-Euler CFD modeling of fluidized bed: Influence of specularity coefficient on hydrodynamic behavior

Chanchal Loha ^a *, Himadri Chattopadhyay ^b, Pradip K. Chatterjee ^a

a Thermal Engineering Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
b Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India

10.1016/j.partic.2012.08.007

Volume 11, Issue 6, December 2013, Pages 673-680

Received 4 April 2012, Revised 11 June 2012, Accepted 14 August 2012, Available online 6 April 2013.

E-mail: chanchal.loha@gmail.com; chanchalcmeri@gmail.com

Highlights

• Euler-Euler two-fluid model with kinetic theory of granular flow was used in this study.

• Different wall boundary conditions including free-slip and no-slip were investigated.

• Different wall boundary conditions may result in some changes in hydrodynamic behavior.

Abstract

Euler-Euler two-fluid model is used to simulate the hydrodynamics of gas–solid flow in a bubbling fluidized bed with Geldert B particles where the solid property is calculated by applying the kinetic theory of granular flow (KTGF). Johnson and Jackson wall boundary condition is used for the particle phase, and different amount of slip between particle and wall is given by varying the specularity coefficient (ϕ) from 0 to 1. The simulated particle velocity, granular temperature and particle volume fraction are compared to investigate the effect of different wall boundary conditions on the hydrodynamic behavior. Some of the results are also compared with the available experimental data from the literature. It was found that the model predictions are sensitive to the specularity coefficient. The hydrodynamic behavior deviated significantly for ϕ = 0 and ϕ = 0.01 with maximum deviation found at ϕ = 0 i.e. free-slip condition. However, the overall bed height predicted by all the conditions is similar.

Graphical abstract

Keywords

Fluidized bed; Hydrodynamics; Specularity coefficient; CFD

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