Size segregation of irregular granular materials captured by time-resolved 3D imaging

Autor: Parmesh Gajjar, Chris G. Johnson, James Carr, Kevin Chrispeels, J. M. N. T. Gray, Philip J. Withers

Publikováno v: Scientific Reports, Vol 11, Iss 1, Pp 1-6 (2021)

Abstract When opening a box of mixed nuts, a common experience is to find the largest nuts at the top. This well-known effect is the result of size-segregation where differently sized ‘particles’ sort themselves into distinct layers when shaken,

Externí odkaz: https://doaj.org/article/0e662af927b04fbcb9d7fc9d6529b740

Particle-size and -density segregation in granular free-surface flows

Autor: J. M. N. T. Gray, Christophe Ancey

Publikováno v: Gray, J M N T & Ancey, C 2015, ' Particle-size and-density segregation in granular free-surface flows ', Journal of Fluid Mechanics, vol. 779, pp. 622-668 . https://doi.org/10.1017/jfm.2015.438

When a mixture of particles, which differ in both their size and their density, avalanches downslope, the grains can either segregate into layers or remain mixed, dependent on the balance between particle-size and particle-density segregation. In thi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1ceb70695bd5797598b5cd92e5cf389a
https://doi.org/10.1017/jfm.2015.438

Gravity-driven granular free-surface flow around a circular cylinder

Autor: J. M. N. T. Gray, Xinjun Cui

Publikováno v: Journal of Fluid Mechanics. 720:314-337

Snow avalanches and other hazardous geophysical granular flows, such as debris flows, lahars and pyroclastic flows, often impact on obstacles as they flow down a slope, generating rapid changes in the flow height and velocity in their vicinity. It is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12026032411f3703d342b9c845219886
https://doi.org/10.1017/jfm.2013.42

Segregation-induced fingering instabilities in granular free-surface flows

Autor: J. M. N. T. Gray, B. P. Kokelaar, Christopher Johnson, Mark J. Woodhouse, Anthony R. Thornton

Publikováno v: Journal of fluid mechanics, 709, 543-580. Cambridge University Press
Woodhouse, M J, Thornton, A R, Johnson, C G, Kokelaar, B P & Gray, J M N T 2012, ' Segregation-induced fingering instabilities in granular free-surface flows ', Journal of Fluid Mechanics, vol. 709, pp. 543-580 . https://doi.org/10.1017/jfm.2012.348

Particle-size segregation can have a significant feedback on the bulk motion of granular avalanches when the larger grains experience greater resistance to motion than the fine grains. When such segregation-mobility feedback effects occur the flow ma

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5e1593ae6030ba45dd37a9d6f6821d8
http://eprints.eemcs.utwente.nl/secure2/23040/01/Segregation-induced_fingering_instabilities_in_granular_free-surface_flows-thornton.pdf

Asymmetric flux models for particle-size segregation in granular avalanches

Autor: Gajjar, Parmesh, Gray, Nico, P. Gajjar and J. M. N. T Gray

Publikováno v: Gajjar, P & Gray, J MNT 2014, ' Asymmetric flux models for particle-size segregation in granular avalanches ', Journal of Fluid Mechanics, vol. 757, pp. 297-329 . https://doi.org/10.1017/jfm.2014.503

Particle-size segregation commonly occurs in both wet and dry granular free-surface flows through the combined processes of kinetic sieving and squeeze expulsion. As the granular material is sheared downslope, the particle matrix dilates slightly and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ea6c2c45d1596418240a5cab7fc4c26
https://www.research.manchester.ac.uk/portal/en/publications/asymmetric-flux-models-for-particlesize-segregation-in-granular-avalanches(78d03728-0c14-4ef5-9b8d-6193194366cb).html