Zeilstra C, van der Hoef M A, Kuipers J A M
Faculty of Science & Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Mar;77(3 Pt 1):031309. doi: 10.1103/PhysRevE.77.031309. Epub 2008 Mar 20.
We have investigated by numerical simulation the density segregation of fine equal-sized bronze and glass particles subject to vertical vibrations. The model was found to be capable of predicting the two main segregation forms ("bronze on top" and "sandwich") in roughly the same regions of the phase diagram as was found experimentally by Burtally We investigated the effects of pressure air forcing, friction and restitution of kinetic energy in collisions, and box size on the segregation behavior. We find that next to the interstitial air friction also has a large influence on the formation of the sandwich structure.
我们通过数值模拟研究了尺寸相等的细小青铜颗粒和玻璃颗粒在垂直振动下的密度分离现象。结果发现，该模型能够在相图的大致相同区域预测出两种主要的分离形式（“青铜在上”和“三明治”），这与布尔塔利通过实验发现的情况相同。我们研究了压力空气强迫、碰撞中动能的摩擦和恢复以及箱体尺寸对分离行为的影响。我们发现，除了间隙空气外，摩擦力对三明治结构的形成也有很大影响。
