The mechanism of long-term coarsening of granular mixtures in rotating drums
Schröter M, Finger T, Stannarius R (2015)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2015
Journal
Publisher: Institute of Physics: Open Access Journals / Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft
Book Volume: 17
Article Number: 093023
Journal Issue: 9
DOI: 10.1088/1367-2630/17/9/093023
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. We demonstrate 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. We suggest possible hypotheses for such a mechanism.
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Germany (DE)How to cite
APA:
Schröter, M., Finger, T., & Stannarius, R. (2015). The mechanism of long-term coarsening of granular mixtures in rotating drums. New Journal of Physics, 17(9). https://dx.doi.org/10.1088/1367-2630/17/9/093023
MLA:
Schröter, Matthias, Tilo Finger, and Ralf Stannarius. "The mechanism of long-term coarsening of granular mixtures in rotating drums." New Journal of Physics 17.9 (2015).
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