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Published July 2014 | Published
Journal Article Open

Investigation of the effect of a bumpy base on granular segregation and transport properties under vertical vibration

Abstract

This study experimentally investigates the effect of a bumpy base on the Brazil-nut phenomenon in a vertically vibrated granular bed. The rise dynamics of an intruder is determined by the particle tracking method. The results indicate that the rise time increases with an increase in the base roughness, and the variation of the rise time with different base factors is more pronounced with smaller vibration acceleration and higher vibration frequency. A theoretical model is employed to measure the penetration length of the intruder and the drag force between the intruder and the immersed beads. The penetration length is reduced and the drag force is enhanced with surface roughness of the base. Additionally, the transport properties of the vibrated glass beads are also measured and discussed. With greater base roughness, the strength of the diffusive and convective motion is reduced leading to a weaker Brazil-nut effect.

Additional Information

© 2014 AIP Publishing LLC. Received 11 April 2014; accepted 2 July 2014; published online 23 July 2014. The authors acknowledge the support from the National Science Council, Taiwan (R.O.C.) for this research (Grant Nos. NSC 100-2221-E-008-078-MY3 and NSC 101-3113-E-008-004).

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August 20, 2023
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