Scaling behaviour of cohesive granular flows

Copyright © EPLA, 2015. The shear strength of dense granular flows is generally described by an effective friction coefficient, ratio of shear to normal stress, as a function of the inertial number I. However, this ratio depends on the normal stress when the particles interact via both friction and...

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Main Authors: Nicolas Berger, Emilien Azéma, Jean François Douce, Farhang Radjai
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/44048
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-440482018-04-25T07:45:04Z Scaling behaviour of cohesive granular flows Nicolas Berger Emilien Azéma Jean François Douce Farhang Radjai Agricultural and Biological Sciences Copyright © EPLA, 2015. The shear strength of dense granular flows is generally described by an effective friction coefficient, ratio of shear to normal stress, as a function of the inertial number I. However, this ratio depends on the normal stress when the particles interact via both friction and adhesion forces, and in this sense it does not properly represent a Coulomb-like friction. For the same reason, it is not a unique function of I. We used extensive contact dynamics simulations to isolate the cohesive strength from the purely frictional strength in dense inertial flows for a broad range of shear rates and adhesion forces between particles. Remarkably, while the frictional part of the strength increases with I, the cohesive strength is found to be a decreasing function of I. We show that a single dimensionless parameter, combining interparticle adhesion with I, controls not only the cohesive strength but also the packing fraction and granular texture in inertial flows. 2018-01-24T04:37:26Z 2018-01-24T04:37:26Z 2015-12-01 Journal 12864854 02955075 2-s2.0-84955493369 10.1209/0295-5075/112/64004 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84955493369&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/44048
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Agricultural and Biological Sciences
spellingShingle Agricultural and Biological Sciences
Nicolas Berger
Emilien Azéma
Jean François Douce
Farhang Radjai
Scaling behaviour of cohesive granular flows
description Copyright © EPLA, 2015. The shear strength of dense granular flows is generally described by an effective friction coefficient, ratio of shear to normal stress, as a function of the inertial number I. However, this ratio depends on the normal stress when the particles interact via both friction and adhesion forces, and in this sense it does not properly represent a Coulomb-like friction. For the same reason, it is not a unique function of I. We used extensive contact dynamics simulations to isolate the cohesive strength from the purely frictional strength in dense inertial flows for a broad range of shear rates and adhesion forces between particles. Remarkably, while the frictional part of the strength increases with I, the cohesive strength is found to be a decreasing function of I. We show that a single dimensionless parameter, combining interparticle adhesion with I, controls not only the cohesive strength but also the packing fraction and granular texture in inertial flows.
format Journal
author Nicolas Berger
Emilien Azéma
Jean François Douce
Farhang Radjai
author_facet Nicolas Berger
Emilien Azéma
Jean François Douce
Farhang Radjai
author_sort Nicolas Berger
title Scaling behaviour of cohesive granular flows
title_short Scaling behaviour of cohesive granular flows
title_full Scaling behaviour of cohesive granular flows
title_fullStr Scaling behaviour of cohesive granular flows
title_full_unstemmed Scaling behaviour of cohesive granular flows
title_sort scaling behaviour of cohesive granular flows
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84955493369&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/44048
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