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Unsteady flow and particle migration in dense, non-Brownian suspensions

dc.creatorHermes, Michiel
dc.creatorGuy, Ben M
dc.creatorPoy, Guilhem
dc.creatorCates, Michael Elmhirst
dc.creatorWyart, Matthieu
dc.creatorPoon, Wilson CK
dc.date.accessioned2016-05-13
dc.date.accessioned2018-11-24T23:18:57Z
dc.date.available2016-06-13T14:22:15Z
dc.date.available2018-11-24T23:18:57Z
dc.date.issued2016
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/256285
dc.identifier.urihttp://repository.aust.edu.ng/xmlui/handle/123456789/3374
dc.description.abstractWe present experimental results on dense corn-starch suspensions as examples of non-Brownian, nearly-hard particles that undergo continuous and discontinuous shear thickening (CST and DST) at intermediate and high densities respectively. Our results offer strong support for recent theories involving a stress-dependent effective contact friction among particles. We show however that in the DST regime, where theory might lead one to expect steady-state shear bands oriented layerwise along the vorticity axis, the real flow is unsteady. To explain this, we argue that steady-state banding is generically ruled out by the requirement that, for hard non-Brownian particles, the solvent pressure and the normal-normal component of the particle stress must balance separately across the interface between bands. (Otherwise there is an unbalanced migration flux.) However, long-lived transient shear bands remain possible.
dc.languageen
dc.publisherAIP
dc.publisherJournal of Rheology
dc.rightshttp://creativecommons.org/licenses/by-nc/4.0/
dc.rightshttp://creativecommons.org/licenses/by-nc/4.0/
dc.rightshttp://creativecommons.org/licenses/by-nc/4.0/
dc.rightsAttribution-NonCommercial 4.0 International
dc.rightsAttribution-NonCommercial 4.0 International
dc.rightsAttribution-NonCommercial 4.0 International
dc.titleUnsteady flow and particle migration in dense, non-Brownian suspensions
dc.typeArticle


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