Effect of coefficient of restitution in Euler–Euler CFD simulation of fluidized-bed hydrodynamics--颗粒学报PARTICUOLOGY

Loha, C., Chattopadhyay, H., & Chatterjee, P. K. (2014). Effect of coefficient of restitution in Euler–Euler CFD simulation of fluidized-bed hydrodynamics. Particuology, 15, 170–177. https://doi.org/10.1016/j.partic.2013.07.001

Effect of coefficient of restitution in Euler–Euler CFD simulation of fluidized-bed hydrodynamics

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

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

10.1016/j.partic.2013.07.001

Volume 15, August 2014, Pages 170-177

Received 10 January 2013, Revised 4 June 2013, Accepted 14 July 2013, Available online 12 September 2013.

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

Highlights

• Effect of elasticity of particle collision on fluidized bed hydrodynamics was investigated.

• Predictions with restitution coefficient of 0.95–0.99 had good agreement with experimental data.

• Assumption of perfectly elastic collision was shown to be unrealistic.

Abstract

Collision between particles plays an important role in determining the hydrodynamic characteristics of gas–solid flow in a fluidized bed. In the present work, earlier work (Loha, Chattopadhyay, & Chatterjee, 2013) was extended to study the effect of the elasticity of particle collision on the hydrodynamic behavior of a bubbling fluidized bed filled with 530-μm particles. The Eulerian–Eulerian two-fluid model was used to simulate the hydrodynamics of the bubbling fluidized bed, where the solid-phase properties were calculated by applying the kinetic theory of granular flow. To investigate the effect of the elasticity of particle collision, different values of the coefficient of restitution were applied in the simulation and their effects were studied in detail. Simulations were performed for two different solid-phase wall boundary conditions. No bubble formation was observed for perfectly elastic collision. The bubble formation started as soon as the coefficient of restitution was set below 1.0, and the space occupied by bubbles in the bed increased with a decrease in the coefficient of restitution. Simulation results were also compared with experimental data available in the literature, and good agreement was found for coefficients of restitution of 0.95 and 0.99.

Graphical abstract

Keywords

Coefficient of restitution; Fluidization; Hydrodynamics; Computational fluid dynamics; Euler–Euler approach

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