Using Discrete Element method (DEM) simulations to reveal the differences in the γ-Al2O3 to α-Al2O3 mechanically induced phase transformation between a planetary ball mill and an attritor mill

2020 ◽  
Vol 155 ◽  
pp. 106374
Author(s):  
Domenico Daraio ◽  
Jose Villoria ◽  
Andrew Ingram ◽  
Alessio Alexiadis ◽  
E. Hugh Stitt ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Discrete Element Method ◽  
Ball Mill ◽  
Discrete Element ◽  
Planetary Ball Mill ◽  
Dem Simulations ◽  
Α Al2o3 ◽  
Element Method

A Study of the Effect of Mineral Particle Shapes on Breakage Rate in Ball Mill Using DEM

2013 ◽  
Vol 658 ◽  
pp. 198-201
Author(s):  
Hong Cheng Li ◽  
Wei Min Dong ◽  
Xing Ping Xie
Keyword(s):  
Discrete Element Method ◽  
Ball Mill ◽  
Great Influence ◽  
Discrete Element ◽  
Mineral Particle ◽  
Regular Tetrahedron ◽  
Breakage Rate ◽  
Impact Energies ◽  
Particle Shapes ◽  
Element Method

In order to investigative the effect of mineral particle shapes to breakage rate of ore, basing on discrete element method, comparative grinding experiments were performed separately in a laboratory ball mill under the same conditions of mass and feed by using regular tetrahedron, parallelepiped and sphere as models of mineral particle. This study shows that ore grain shapes have a great influence on breakage rate due to different impact energies in ball mill.

Effects of the Friction Coefficient of a Barrel on Grinding Performances in Planetary Ball Mill

2017 ◽  
Author(s):  
B. C. Kim ◽  
G. H. Jang
Keyword(s):  
Friction Coefficient ◽  
Discrete Element Method ◽  
Ball Mill ◽  
Relative Velocity ◽  
Discrete Element ◽  
Linear Velocity ◽  
Planetary Ball Mill ◽  
Friction Coefficients ◽  
Before And After ◽  
Shear Energy

We investigated the effect of the friction coefficients of a barrel on grinding performances in a planetary ball mill. The linear velocity of chips, impaction and shear energy according to the friction coefficients were simulated by the discrete element method (DEM). The increase of the friction coefficient of the barrel not only improves the shear energy due to increasing the relative velocity between chips, but also reduces the impaction due to decreasing the average linear velocity of the chips. Finally, we validated the simulated result by measuring the removal amount of chips before and after grinding test and comparing with shear energy. The experimental results show the similar trend as the simulated results.

scholarly journals A Discrete Element Method Study of Solids Stress in Cylindrical Columns Using MFiX

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 60
Author(s):  
Filippo Marchelli ◽  
Renzo Di Felice
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Solid Particles ◽  
Static System ◽  
Bottom Pressure ◽  
Filling Rate ◽  
Dem Simulations ◽  
Source Program ◽  
Detailed Assessment ◽  
Element Method

Friction phenomena play a key role in discrete element method (DEM) modeling. To analyze this aspect, we employed the open-source program MFiX to perform DEM simulations of cylindrical vertical columns filled with solid particles. These are still associated with and described by the pioneering model by the German engineer H.A. Janssen. By adapting the program’s code, we were able to gather numerous insights on the stress distribution within the solids. The column was filled with different amounts of solids and, after the system had stabilized, we assessed the pressure in the vertical and radial directions and the distribution of the friction force for all particles. An analysis of the bottom pressure for varying particle loads allowed us to infer that the program can correctly predict the expected asymptotical behavior. After a detailed assessment of the behavior of a single system, we performed a sensitivity analysis taking into account several of the variables employed in the simulations. The friction coefficient and filling rate seem to affect the final behavior the most. The program appears suitable to describe friction phenomena in such a static system.

Sign in / Sign up

Export Citation Format

Share Document