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Partic. vol. 46 pp. 93-98 (October 2019)
doi: 10.1016/j.partic.2019.03.001

Horizontal flow in a vertically vibrated granular layer

Hui Caia,*, Guoqing Miaob

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caihui@ycit.edu.cn

Highlights

    • Horizontal granular flow induced by a thermal ratchet is studied in experiments. • Horizontal granular flow varies with time, space, and driving parameters. • Exchange of horizontal momentum is thought responsible for the experimental findings.

Abstract

Motivated by the investigation of Brownian motors in excited granular materials that convert chaotic motion of granules into oriented motion of motors, we performed experimental studies to explore the horizontal flow in a vertically vibrated granular layer in an asymmetric periodic potential. The horizontal flow exhibits complex behaviors, considered as functions of time, space, and driving parameters, which are essentially caused by a thermal ratchet. We interpret our experimental findings in terms of the granular layer gaining, transferring and losing horizontal momentum through inelastic collisions.

Graphical abstract

Keywords

Granular flow; Granular materials; Thermal ratchets