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Size segregation of intruders in perpetual granular avalanches

Benjy Marks, Jon Alm Eriksen, Guillaume Dumazer, Bjørnar Sandnes, Knut Jørgen Måløy, Bjornar Sandnes Orcid Logo

Journal of Fluid Mechanics, Volume: 825, Pages: 502 - 514

Swansea University Author: Bjornar Sandnes Orcid Logo

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DOI (Published version): 10.1017/jfm.2017.419

Abstract

Granular flows such as landslides, debris flows and avalanches are systems of particles with a large range of particle sizes that typically segregate while flowing. The physical mechanisms responsible for this process, however, are still poorly understood, and there is no predictive framework for as...

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Published in: Journal of Fluid Mechanics
ISSN: 0022-1120 1469-7645
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34155
first_indexed 2017-06-06T13:42:07Z
last_indexed 2018-02-09T05:23:59Z
id cronfa34155
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spelling 2017-08-07T14:36:22.3159603 v2 34155 2017-06-06 Size segregation of intruders in perpetual granular avalanches 61c7c04b5c804d9402caf4881e85234b 0000-0002-4854-5857 Bjornar Sandnes Bjornar Sandnes true false 2017-06-06 EAAS Granular flows such as landslides, debris flows and avalanches are systems of particles with a large range of particle sizes that typically segregate while flowing. The physical mechanisms responsible for this process, however, are still poorly understood, and there is no predictive framework for ascertaining the segregation behaviour of a given system of particles. Here, we provide experimental evidence of individual large intruder particles being attracted to a fixed point in a dry two-dimensional flow of particles of otherwise uniform size. A continuum theory is proposed which captures this effect using only a single fitting parameter that describes the rate of segregation, given knowledge of the bulk flow field. Predictions of the continuum theory are compared with the experimental findings, both for the typical location and velocity field of a range of intruder sizes. For large intruder particle sizes, the continuum model successfully predicts that a fixed point attractor will form, where intruders are drawn to a single location. Journal Article Journal of Fluid Mechanics 825 502 514 0022-1120 1469-7645 31 8 2017 2017-08-31 10.1017/jfm.2017.419 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2017-08-07T14:36:22.3159603 2017-06-06T11:50:15.4253052 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Benjy Marks 1 Jon Alm Eriksen 2 Guillaume Dumazer 3 Bjørnar Sandnes 4 Knut Jørgen Måløy 5 Bjornar Sandnes 0000-0002-4854-5857 6 0034155-06062017115324.pdf marks2017.pdf 2017-06-06T11:53:24.8900000 Output 1612148 application/pdf Accepted Manuscript true 2018-01-21T00:00:00.0000000 true eng
title Size segregation of intruders in perpetual granular avalanches
spellingShingle Size segregation of intruders in perpetual granular avalanches
Bjornar Sandnes
title_short Size segregation of intruders in perpetual granular avalanches
title_full Size segregation of intruders in perpetual granular avalanches
title_fullStr Size segregation of intruders in perpetual granular avalanches
title_full_unstemmed Size segregation of intruders in perpetual granular avalanches
title_sort Size segregation of intruders in perpetual granular avalanches
author_id_str_mv 61c7c04b5c804d9402caf4881e85234b
author_id_fullname_str_mv 61c7c04b5c804d9402caf4881e85234b_***_Bjornar Sandnes
author Bjornar Sandnes
author2 Benjy Marks
Jon Alm Eriksen
Guillaume Dumazer
Bjørnar Sandnes
Knut Jørgen Måløy
Bjornar Sandnes
format Journal article
container_title Journal of Fluid Mechanics
container_volume 825
container_start_page 502
publishDate 2017
institution Swansea University
issn 0022-1120
1469-7645
doi_str_mv 10.1017/jfm.2017.419
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description Granular flows such as landslides, debris flows and avalanches are systems of particles with a large range of particle sizes that typically segregate while flowing. The physical mechanisms responsible for this process, however, are still poorly understood, and there is no predictive framework for ascertaining the segregation behaviour of a given system of particles. Here, we provide experimental evidence of individual large intruder particles being attracted to a fixed point in a dry two-dimensional flow of particles of otherwise uniform size. A continuum theory is proposed which captures this effect using only a single fitting parameter that describes the rate of segregation, given knowledge of the bulk flow field. Predictions of the continuum theory are compared with the experimental findings, both for the typical location and velocity field of a range of intruder sizes. For large intruder particle sizes, the continuum model successfully predicts that a fixed point attractor will form, where intruders are drawn to a single location.
published_date 2017-08-31T01:27:26Z
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score 11.064692

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