Brewster Robert, Grest Gary S, Levine Alex J
Department of Materials and Interfaces, Weizmann Institute of Science, P.O. Box 26, Rehovot 76100, Israel.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Jan;79(1 Pt 1):011305. doi: 10.1103/PhysRevE.79.011305. Epub 2009 Jan 30.
Large scale, discrete element simulations are performed to study the dynamics of a rotating drum partially filled with cohesive granular particles. The continuous avalanche regime is explored using a simple model for interparticle cohesion in order to simulate the effects of granular media in the presence of a wetting fluid. The shape of the free surface for cohesionless particles ranges from flat to a concave S shape depending on the rotation rate and frictional properties between the grains and the drum side walls. The presence of interparticle cohesion reduces the concavity of the free surface and pushes the free surface towards a flat or even slightly convex shape. From contour plots of the velocity, we show how the position of the vortex core (the stationary spot in the laboratory frame) depends on the rotation speed and interparticle cohesion strength and how this relationship can be understood from considerations of the incompressibility condition on the mass flow.
进行大规模离散元模拟，以研究部分填充有粘性颗粒的转鼓的动力学。使用一个简单的颗粒间凝聚模型来探索连续雪崩状态，以便模拟在存在湿润流体的情况下颗粒介质的影响。对于无粘性颗粒，自由表面的形状根据转速以及颗粒与转鼓侧壁之间的摩擦特性，从平坦到凹形S形变化。颗粒间凝聚的存在会减小自由表面的凹度，并使自由表面趋向于平坦甚至略微凸起的形状。从速度的等高线图中，我们展示了涡核（实验室坐标系中的静止点）的位置如何取决于转速和颗粒间凝聚强度，以及如何从质量流的不可压缩条件的考虑来理解这种关系。
