Simulation of Grinding Media Motion and Collisions in Wet-Operated Accelerator-Mill Using DEM Coupled with CFD

The relative motion and collision between grinding media in a wet-stirred accelerator mill are modelled using the discrete element method (DEM) coupled with computational fluid dynamics (CFD). The local average normalized grinding media velocity profile is employed to divide the grinding chamber int...

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Bibliographic Details
Published inMinerals (Basel) Vol. 12; no. 3; p. 341
Main Authors He, Kang, Jia, Minping, Sun, Fei, Yang, Quan, Wu, Bo, Li, Xiaobiao, Meng, Chao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2022
Subjects
accelerator-mill
Collisions
Computational fluid dynamics
Computer applications
coupled DEM–CFD simulations
Discrete element method
Distribution
Energy
Energy distribution
Energy efficiency
Fluid dynamics
Friction
Grinding mills
Homogenization
Hydrodynamics
Industrial applications
Mathematical models
Media
Movement
Navier-Stokes equations
Particle collisions
Pesticides
Product development
Simulation
Stress
stress energy model
Turbulence models
Velocity
Velocity distribution
Velocity profiles
Viscosity
wet grinding
Zirconium oxides
United Kingdom > UK
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Summary:The relative motion and collision between grinding media in a wet-stirred accelerator mill are modelled using the discrete element method (DEM) coupled with computational fluid dynamics (CFD). The local average normalized grinding media velocity profile is employed to divide the grinding chamber into four volumes, which facilitates the analysis of the stress energy distribution. The local grinding media filling levels, velocity distributions, stress energy distributions and energy efficiencies are compared at various total grinding media filling levels and stirrer speeds. The rationality of the division of stress energy volume was verified by the stress energy distribution. The stress intensity, stress number and collision stress energy from the grinding media’s motion and particle collisions exhibited different distributions, with the stress number playing a leading role in the collision stress energy distribution. Moreover, energy efficiency is quantitatively characterized under different process conditions. This simulation-based research provides a theoretical reference for the industrial application and product development of accelerator mills used for grinding applications.
ISSN:2075-163X
2075-163X
DOI:10.3390/min12030341