We propose a continuum description for the axial separation of granular materials in a long rotating drum. The model, operating with two local variables, concentration difference and the dynamic angle of repose, describes both initial transient traveling wave dynamics and long-term segregation of the binary mixture. Segregation proceeds through ultraslow logarithmic coarsening. [S0031-9007(99)0...

A dominant aspect of granular flows is flow in thin surface layers. While an understanding of the dynamics of dry granular surface flow has begun to emerge, the case of flow when air is completely replaced by a liquid is largely unexplored. Experiments were performed using particle tracking velocimetry (PTV) in a quasitwo-dimensional rotating tumbler to measure the velocity field within the flo...

We explore the notion of angle of repose for granular materials. As an illustration, we solve free surface problems for centrifuged granular piles. These have recently been considered as an affordable and simple way to experiment with powders and dust in reduced gravity environments such as on the Moon or on Mars.

The round robin test (the simultaneous analysis of the same problem) is a method to investigate variance and sensitivity results provided by different analysts for given problem reliability particular software used each group participating in test. A has been conducted traditional numerical (e.g., finite difference method), but not yet discrete element (DEM). This paper presents first ever on D...

Corn kernel shape is an important feature to improve the accuracy of simulation results, also repose angle often used calibrate model parameters in simulation. In this study, effects corn shapes on behavior during kernels accumulation were investigated detail. Firstly, DEM models three typical developed. Secondly, influences process for forming investigated, such as distance change, energy conv...