(222b) Exploration of Percolation in Large Size Ratio Two-Sized Vibrated Systems Using Discrete Element Method

Segregation in granular systems can cause changes in system behaviour and reduce the quality of products in industrial applications where product homogeneity is sought after. Despite this, research into the causes and potential preventative measures of segregation is still ongoing, owed in part to both the complexity and breadth of the research area. The use of numerical methods such as DEM in investigating and preventing the segregation of granular systems has great potential, due to their ability to investigate systems across wide parameter spaces whilst avoiding the significant cost and time expenses typically associated with such investigations.

This presentation will explore ongoing work into the factors influencing particle segregation within a vibrated binary system consisting of two different sized particles with a large size ratio (1:15). The system is simulated in DEM by first inserting the coarse particles into a cylindrical mould, vibrating the system to rearrange their structure and densify the coarse packing, and then inserting the fine particles during further vibration.

The system was used to investigate the effects of the following on the percolation of fines through the system:

• The packing density of coarse particles
• Fine particle asphericity
• Fine particle restitution coefficient

The results of these investigations contribute towards a greater understanding of particle segregation within vibrated granular systems, particularly in those containing large particle size ratios, which remain comparatively under-researched.

This presentation will outline the key findings from the study and showcase the potential of numerical methods such as DEM in understanding and preventing segregation within granular systems.