Shear-induced diffusion in cohesive granular flows: Effect of enduring clusters

Macaulay, M; Rognon, P

Shear-induced diffusion in cohesive granular flows: Effect of enduring clusters

Macaulay, M

Rognon, P

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Publisher:: CAMBRIDGE UNIV PRESS
Publication Type:: Journal Article
Citation:: Journal of Fluid Mechanics, 2019, 858
Issue Date:: 2019-01-10

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Field	Value	Language
dc.contributor.author	Macaulay, M https://orcid.org/0000-0002-6865-7979
dc.contributor.author	Rognon, P
dc.date.accessioned	2022-04-01T00:27:43Z
dc.date.available	2022-04-01T00:27:43Z
dc.date.issued	2019-01-10
dc.identifier.citation	Journal of Fluid Mechanics, 2019, 858
dc.identifier.issn	0022-1120
dc.identifier.issn	1469-7645
dc.identifier.uri	http://hdl.handle.net/10453/155836
dc.description.abstract	We investigate the effect of intergranular cohesive forces on the properties of self-diffusion in dense granular flows. The study is based on a series of simulated plane shear flows at different inertial and cohesion numbers, in which transverse diffusivities are measured. Results evidence an increase in diffusivity by up to two orders of magnitude when introducing cohesion. This strong effect is analysed using the Green-Kubo framework, expressing the diffusivity in terms of instantaneous grain velocity fluctuations and their time correlation. This analysis shows that cohesion, by forming enduring clusters in the flow, enhances the velocity fluctuations and their time persistence, which both contribute to enhancing grain mixing and self-diffusion.
dc.language	English
dc.publisher	CAMBRIDGE UNIV PRESS
dc.relation.ispartof	Journal of Fluid Mechanics
dc.relation.isbasedon	10.1017/jfm.2018.861
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	01 Mathematical Sciences, 09 Engineering
dc.subject.classification	Fluids & Plasmas
dc.title	Shear-induced diffusion in cohesive granular flows: Effect of enduring clusters
dc.type	Journal Article
utslib.citation.volume	858
utslib.for	01 Mathematical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access	*
dc.date.updated	2022-04-01T00:27:39Z
pubs.publication-status	Published
pubs.volume	858

Abstract:

We investigate the effect of intergranular cohesive forces on the properties of self-diffusion in dense granular flows. The study is based on a series of simulated plane shear flows at different inertial and cohesion numbers, in which transverse diffusivities are measured. Results evidence an increase in diffusivity by up to two orders of magnitude when introducing cohesion. This strong effect is analysed using the Green-Kubo framework, expressing the diffusivity in terms of instantaneous grain velocity fluctuations and their time correlation. This analysis shows that cohesion, by forming enduring clusters in the flow, enhances the velocity fluctuations and their time persistence, which both contribute to enhancing grain mixing and self-diffusion.

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http://hdl.handle.net/10453/155836