Molecular Dynamics of Comminution in Ball Mills
Volkhard Buchholtz, Jan A. Freund, and Thorsten Poeschel
TL;DR
This study uses two-dimensional molecular dynamics simulations to analyze how force chains influence particle breakage in rotating ball mills, providing insights into the spatial distribution of comminution efficiency.
Contribution
It introduces a detailed simulation approach to understand autogenous fragmentation and highlights the role of force chains in comminution processes.
Findings
Force chains are key to comminution in ball mills.
Spatial force distribution correlates with experimental efficiency.
Simulations match observed fragmentation patterns.
Abstract
We investigate autogenous fragmentation of dry granular material in rotating cylinders using two-dimensional molecular dynamics. By evaluation of spatial force distributions achieved numerically for various rotation velocities we argue that comminution occurs mainly due to the existence of force chains. A statistical analysis of theses force chains explains the spatial distribution of comminution efficiency in ball mills as measured experimentally by Rothkegel and Rolf. For animated sequences of our simulations see http://summa.physik.hu-berlin.de/~kies/Research/RotatingCylinder/rotatingcylind er.html
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