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Title: Effect of geometric base roughness on size segregation
Authors: Jing, L
Kwok, CY
Leung, YF 
Sobral, YD
Issue Date: 2017
Publisher: EDP Sciences
Source: EPJ web of conferences, 2017, v. 140, 03056, p. 1-4 How to cite?
Journal: EPJ web of conferences 
Abstract: The geometric roughness at boundaries has a profound impact on the dynamics of granular flows. For a bumpy base made of fixed particles, two major factors have been separately studied in the literature, namely, the size and spatial distribution of base particles. A recent work (Jing et al. 2016) has proposed a roughness indicator Ra, which combines both factors for any arbitrary bumpy base comprising equally-sized spheres. It is shown in mono-disperse flows that as Ra increases, a transition occurs from slip (Ra &ltMergeCell 0.51) to non-slip (Ra &gtMergeCell 0.62) conditions. This work focuses on such a phase transition in bi-disperse flows, in which Ra can be a function of time. As size segregation takes place, large particles migrate away from the bottom, leading to a variation of size ratio between flow- and base-particles. As a result, base roughness Ra evolves with the progress of segregation. Consistent with the slip/non-slip transition in mono-disperse flows, basal sliding arises at low values of Ra and the development of segregation might be affectedMergeCell when Ra increases to a certain level (Ra &gtMergeCell 0.62), non-slip condition is respected. This work extends the validity of Ra to bi-disperse flows, which can be used to understand the geometric boundary effect during segregation.
Description: 8th International Conference on Micromechanics on Granular Media, Powders and Grains 2017, 3 - 7 July 2017
ISSN: 2101-6275
DOI: 10.1051/epjconf/201714003056
Rights: © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (
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