Determination of the physical and interaction properties of sorghum grains: Application to computational fluid dynamics–discrete element method simulations of the fluid dynamics of a conical spouted bed--颗粒学报PARTICUOLOGY

Batista, J. N. M., Santos, D. A., & Béttega, R. (2021). Determination of the physical and interaction properties of sorghum grains: Application to computational fluid dynamics–discrete element method simulations of the fluid dynamics of a conical spouted bed. Particuology, 54, 91-101. https://doi.org/10.1016/j.partic.2020.04.005

Determination of the physical and interaction properties of sorghum grains: Application to computational fluid dynamics–discrete element method simulations of the fluid dynamics of a conical spouted bed

J.N.M. Batista ^a, D.A. Santos ^b, R. Béttega ^a *

a Federal University of São Carlos, Department of Chemical Engineering, SP, Brazil
b Institute of Chemistry, Federal University of Goiás, GO, Brazil

10.1016/j.partic.2020.04.005

Volume 54, February 2021, Pages 91-101

Received 16 March 2020, Revised 27 April 2020, Accepted 29 April 2020, Available online 23 June 2020, Version of Record 28 January 2021.

E-mail: bettega@ufscar.br

Highlights

• Conical spouted bed fluid dynamics evaluated by CFD–DEM.

• The measured properties were used as DEM input parameters.

• The minimum spouting velocity was determined using a fluid dynamics curve.

• Small deviations indicated that the flow dynamics can be described by CFD–DEM.

Abstract

Computational simulation is an important tool for design and improvement of industrial units. Computational fluid dynamics (CFD) coupled with the discrete element method (DEM) has been applied to simulate drying equipment that usually involves gas–solid flow. For reliable results of CFD–DEM simulations, the properties related to the interactions of the material within the industrial equipment, such as the restitution or friction coefficients, must be known. In this study, CFD–DEM was applied to simulate the fluid dynamics inside a conical spouted bed operating with sorghum grains. The physical properties of the particulate phase and the particle–particle and particle–wall interaction parameters were determined by the direct measurement approach and applied to CFD–DEM. The interaction parameters were experimentally determined, including the particle–particle interaction parameters of η = 0.46, μ_S = 0.79, and μ_R = 0.70, and the particle–wall interaction parameters of η = 0.56, μ_S = 0.75, and μ_R = 0.40. The simulated minimum spouting velocity and characteristic curves were compared with the experimental results. There was good agreement between the simulated and experimental results.

Graphical abstract

Keywords

Restitution coefficient; Static friction coefficient; Rolling friction coefficient; CFD; DEM

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