Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
Phys Rev Lett. 2010 Sep 10;105(11):118001. doi: 10.1103/PhysRevLett.105.118001. Epub 2010 Sep 7.
The dynamics of a segregation pattern for a granular mixture in a highly filled rotating drum were studied. A spontaneously segregated band pattern traveled laterally and was accompanied by the repeated creation of new bands near the center of the drum and annihilation at both of its ends. The presence of nearly stationary convection plays an essential role in causing this traveling wave. Based on direct observations of both the interior and the exterior of the segregation pattern, this spatiotemporal pattern is interpreted in terms of a one-dimensional Cahn-Hilliard equation by including the effect of stationary convection.
研究了高填充旋转鼓中颗粒混合物的分离模式的动力学。一个自发分离的带状模式在横向移动，并伴随着在鼓中心附近反复形成新带和在两端消失。几乎静止的对流的存在对产生这种行波起着至关重要的作用。基于对分离模式内部和外部的直接观察，通过包括静止对流的影响，用一个一维的 Cahn-Hilliard 方程来解释这个时空模式。
