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  The mechanism of long-term coarsening of granular mixtures in rotating drums

Finger, T., Schröter, M., & Stannarius, R. (2015). The mechanism of long-term coarsening of granular mixtures in rotating drums. New Journal of Physics, 17: 093023. doi:10.1088/1367-2630/17/9/093023.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5EE3-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2899-3
Genre: Journal Article

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 Creators:
Finger, Tilo, Author
Schröter, Matthias1, Author              
Stannarius, Ralf, Author
Affiliations:
1Group Statistical mechanics of granular media, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063310              

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 Abstract: Three fundamental segregation and pattern formation processes are known in granular mixtures in a rotating cylindrical drum: radial segregation, axial banding, and coarsening of the band pattern. While the mechanism for the first effect is well understood and for the second effect, several models have been proposed, the long-term coarsening mechanism remained unexplained so far.Wedemonstrate that the unidirectional flow between the bands in an axially segregated pattern is driven by small differences in size of the small beads at the band edges. Due to a process of microsegregation inside each band of small particles, which was so far unrecognized, this difference in diameter will be effective in all experiments with polydisperse beads. In consequence the stability of individual bands can be easily controlled by minor alterations of their composition. Our results make evident that a new mechanism as the driving force behind the axial particle flow has to be sought.Wesuggest possible hypotheses for such a mechanism.

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Language(s): eng - English
 Dates: 2015-09-142015
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1088/1367-2630/17/9/093023
BibTex Citekey: finger-njp-2015
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Title: New Journal of Physics
Source Genre: Journal
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Publ. Info: -
Pages: 11 Volume / Issue: 17 Sequence Number: 093023 Start / End Page: - Identifier: ISSN: 1367-2630