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Conference Paper: Effect of geometric base roughness on size segregation

TitleEffect of geometric base roughness on size segregation
Authors
Issue Date2017
PublisherEDP Sciences. The Journal's web site is located at http://www.epj-conferences.org
Citation
Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media, Montpellier, France, 3-7 July 2017. In EPJ Web of Conferences, 2017, v. 140, article no. 03056 How to Cite?
AbstractThe 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 < 0.51) to non-slip (Ra > 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 affected; when Ra increases to a certain level (Ra > 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.
DescriptionInvited talk - Session on Granular Flows (2)
Persistent Identifierhttp://hdl.handle.net/10722/265203
ISSN

 

DC FieldValueLanguage
dc.contributor.authorJing, L-
dc.contributor.authorKwok, CY-
dc.contributor.authorLeung, YF-
dc.contributor.authorSobral, YD-
dc.date.accessioned2018-11-20T02:02:06Z-
dc.date.available2018-11-20T02:02:06Z-
dc.date.issued2017-
dc.identifier.citationPowders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media, Montpellier, France, 3-7 July 2017. In EPJ Web of Conferences, 2017, v. 140, article no. 03056-
dc.identifier.issn2100-014X-
dc.identifier.urihttp://hdl.handle.net/10722/265203-
dc.descriptionInvited talk - Session on Granular Flows (2)-
dc.description.abstractThe 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 < 0.51) to non-slip (Ra > 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 affected; when Ra increases to a certain level (Ra > 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.-
dc.languageeng-
dc.publisherEDP Sciences. The Journal's web site is located at http://www.epj-conferences.org-
dc.relation.ispartofEPJ Web of Conferences-
dc.relation.ispartof8th International Conference on Micromechanics on Granular Media (Powders and Grains 2017), Montpellier, France-
dc.rightsReproduced with permission from Astronomy & Astrophysics, © ESO-
dc.titleEffect of geometric base roughness on size segregation-
dc.typeConference_Paper-
dc.identifier.emailJing, L: lljing@hku.hk-
dc.identifier.emailKwok, CY: fkwok8@hku.hk-
dc.identifier.authorityKwok, CY=rp01344-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1051/epjconf/201714003056-
dc.identifier.scopuseid_2-s2.0-85024129417-
dc.identifier.hkuros296015-
dc.identifier.volume140-
dc.identifier.spageArticle Number 03056-
dc.identifier.epageArticle Number 03056-
dc.publisher.placeFrance-

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