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Segregation in Vertically Vibrated Binary Granular Mixtures with Same Size |
| SHI Qing-Fan1,2;SUN Gang1;HOU Mei-Ying1;LU Kun-Quan1 |
| 1Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, Beijing Institute of Technology, Beijing 100081 |
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| Cite this article: |
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SHI Qing-Fan, SUN Gang, HOU Mei-Ying et al 2006 Chin. Phys. Lett. 23 3080-3083 |
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Abstract 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 Γ 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.
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| Keywords:
75.10.Hk
64.60.Cn
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Published: 01 November 2006
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| PACS: |
75.10.Hk
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(Classical spin models)
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64.60.Cn
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(Order-disorder transformations)
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