The dynamic behavior of cohesive granular flows is important in geo-mechanics and industrial applications, yet poorly understood. We studied the effects of liquid viscosity and particle size on the dynamics of wet granular avalanches, occurring in a slowly rotating drum. A Discrete Element Method (DEM) model, in which contact forces and cohesive forces were considered, was employed to simulate this flow behavior. We found that the avalanche amplitude, flow layer velocity and granular temperature decrease as viscosity increases, but increase with particle size. Increasing the viscous forces causes the flow to behave as a bulk, pushing the free surface towards a convex shape, and avalanches become less pronounced. We found that this transition from avalanching flow to continuous flow can be characterized by evaluating the local fluctuations of the surface angle.
|Number of pages||10|
|Publication status||Published - 1 Jul 2019|
|Event||8th International Conference on Discrete Element Methods, DEM 2019: MS-03: Open-source development - University of Twente, Waaier building, Enschede, Netherlands|
Duration: 21 Jul 2019 → 26 Jul 2019
Conference number: 8
|Conference||8th International Conference on Discrete Element Methods, DEM 2019|
|Abbreviated title||DEM 2019|
|Period||21/07/19 → 26/07/19|
- Granular Materials
- Granular Avalanche
- Liquid Induced Cohesion
- Rotary Drum
Kasper , J. H., Magnanimo, V., & Jarray, A. (2019). Dynamics of discrete wet granular avalanches in a rotary drum. 1. Paper presented at 8th International Conference on Discrete Element Methods, DEM 2019, Enschede, Netherlands.