Abstract
Discrete element method (DEM) is applied to study the granular accumulation problem. Using Herz-Mindlin (no slip) model to simulate particles and container model is also established by software. When the container elevates, the process of granular falling and collision can be ob-served. Detailed analysis of that the impact of static and rolling friction coefficient for particles - particles, particles - flat on angle of repose is accomplished. The variation law is also further val-idated from the energy point of view. The results show that rolling friction has a greater impact on angle of repose than static friction, and rolling friction coefficient among particles play the more prominent role in the two kinds of rolling friction. The research method and results provide a the-oretical reference for the granular movement and DEM analysis.
Highlights
Friction inevitably accompanies the granular movement, whose strength is limited
Angle of repose is the angle between the natural slope and horizon when the static granular accumulation process is completed under some assigned conditions
Angle of repose reflects the macroscopic granular characteristics, which is related with machinery, transportation, metallurgy, energy and other practical applications of engineering and agriculture
Summary
Friction inevitably accompanies the granular movement, whose strength is limited. Angle of repose is the angle between the natural slope and horizon when the static granular accumulation process is completed under some assigned conditions. Angle of repose reflects the macroscopic granular characteristics, which is related with machinery, transportation, metallurgy, energy and other practical applications of engineering and agriculture. All above have severe impacts on research and development of bulk material handling and stacker equipments. As granular geometries and movement patterns are very complex, it is difficult to describe bulk material by the continuous function. Some scholars individually conducted detailed studies on the granular accumulation characteristic by molecular dynamics and discrete element method in order to calculate and predict the granular movement state more accurately [1][2],[3]
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