Patterns of granular convection and separation in narrow vibration bed

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Abstract

Granular convection/separation of single and binary component particles are studied in a narrow vibration bed, respectively. With filling the single light particles (molecular sieve beads), the bed exhibits five different states successively by increasing the vibration frequency f from 15Hz to 70 Hz (vibration strength Γ>3), as the global convection, symmetrical heap, unsymmetrical heap, local convection and pseudo solid. Comparatively, the granular bed of the single heavy particles (steel beads) is only in pseudo solid state at the above vibration condition. By filling binary component particles (molecular sieve and same size steel beads) instead of the single component, the bed shows similar convection state with that of the single molecular sieve beads, and the heavy steel beads are aggregated in the centre of convention roll as a core. Varying the initial distribution of binary component particles, the final convection and separation are not influenced, although the aggregation process of steel beads changes.

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Liu, C., Wu, P., Wang, L., Tong, L., & Yin, S. (2017). Patterns of granular convection and separation in narrow vibration bed. In EPJ Web of Conferences (Vol. 140). EDP Sciences. https://doi.org/10.1051/epjconf/201714003031

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