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Air-Driven Segregation in Binary Granular Mixtures with Same Size but Different Densities |
| LU Chang-Hong1,2, SHI Qing-Fan1, YANG Lei1, SUN Gang2 |
| 1Department of Physics, Beijing Institute of Technology, Beijing 1000812Institute of Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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LU Chang-Hong, SHI Qing-Fan, YANG Lei et al 2008 Chin. Phys. Lett. 25 2542-2545 |
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Abstract We investigate the segregation effect of binary granular mixtures with the same size but different densities under vibration at different air pressures. Our experiments show that the segregation state is seriously dependent on the air pressure and there is a new type of partially segregated state at high air pressure, which has the characteristic that the lighter grains tend to stay at the bottom and form a pure layer, while heavier grains and remained lighter ones tend to rise and to form a mixed layer on the top of the system. We redefine the order parameter to study the variation of the segregation effect with the air pressure and vibration parameter in detail. Finally, the mechanism of the air-driven segregation is illustrated by the faster acceleration due to the airflow through the granular bed for lighter particles.
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| Keywords:
45.70.Mg
64.60.Cn
75.10.Hk
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Received: 26 January 2008
Published: 26 June 2008
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| PACS: |
45.70.Mg
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(Granular flow: mixing, segregation and stratification)
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64.60.Cn
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(Order-disorder transformations)
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75.10.Hk
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(Classical spin models)
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