Segregation in Vertically Vibrated Binary Granular Mixtures with Same Size  

作　　者：史庆藩 孙刚 厚美瑛 陆坤权 

机构地区：[1]Institute of Physics, Chinese Academy of Sciences, Beijing 100080 [2]Department of Physics, Beijing Institute of Technology, Beijing 100081

出　　处：《Chinese Physics Letters》2006年第11期3080-3083,共4页中国物理快报（英文版）

基　　金：Supported by the National Key Programme for Basic Research of China, and the National Science Foundation of China under Grant No 10374111.

摘　　要：Segregation in vertically vibrated binary granular mixtures with same size is studied experimentally. A new partial segregated state is found in this system. This state exists between the completely mixed state and the pure segregated state, and has the characteristic that the lighter particles tend to rise and form a pure layer on the top of the system while the heavier particles and some of the lighter ones stay at the bottom and form a mixed layer. The ratio of the thickness of the pure top layer and that of the whole system varies continuously with the vibration frequency or amplitude. It is suggested to consider the ratio as an order parameter for describing the degree of the segregation quantitatively. By use of the order parameter, a detailed phase diagram is obtained in Г versus f space. Finally, the formation of the observed partial segregated state is illustrated by the competition between the impact of momentum of the heavier particles and the stiffness of the layer composed of the mixed particles.Segregation in vertically vibrated binary granular mixtures with same size is studied experimentally. A new partial segregated state is found in this system. This state exists between the completely mixed state and the pure segregated state, and has the characteristic that the lighter particles tend to rise and form a pure layer on the top of the system while the heavier particles and some of the lighter ones stay at the bottom and form a mixed layer. The ratio of the thickness of the pure top layer and that of the whole system varies continuously with the vibration frequency or amplitude. It is suggested to consider the ratio as an order parameter for describing the degree of the segregation quantitatively. By use of the order parameter, a detailed phase diagram is obtained in Г versus f space. Finally, the formation of the observed partial segregated state is illustrated by the competition between the impact of momentum of the heavier particles and the stiffness of the layer composed of the mixed particles.

关 键 词：FLOWS SEPARATION AVALANCHES SOLIDS MATTER 

分 类 号：O572.2[理学—粒子物理与原子核物理]