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Gravity Induced Ordering of Frictional Fingers

Jon Alm Eriksen, Bjornar Sandnes Orcid Logo, Renaud Toussaint, Knut Jorgen Maloy, Eirik Grude Flekkoy

Geophysical Research Abstracts 16, EGU2014-14715., Volume: 16

Swansea University Author: Bjornar Sandnes Orcid Logo

Abstract

Experiments on confined two-phase flow systems, involving air and adense suspension, have revealed highly non-trivial flowmorphologies. As the air displaces the suspension, the grains thatmake up the suspension tend to accumulate along the interface, and canbuild up force chains that jam the accumul...

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Published in: Geophysical Research Abstracts 16, EGU2014-14715.
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa21347
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2016-08-04T14:14:41.2352305</datestamp><bib-version>v2</bib-version><id>21347</id><entry>2015-05-13</entry><title>Gravity Induced Ordering of Frictional Fingers</title><swanseaauthors><author><sid>61c7c04b5c804d9402caf4881e85234b</sid><ORCID>0000-0002-4854-5857</ORCID><firstname>Bjornar</firstname><surname>Sandnes</surname><name>Bjornar Sandnes</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2015-05-13</date><deptcode>CHEG</deptcode><abstract>Experiments on confined two-phase flow systems, involving air and adense suspension, have revealed highly non-trivial flowmorphologies. As the air displaces the suspension, the grains thatmake up the suspension tend to accumulate along the interface, and canbuild up force chains that jam the accumulated region. This dynamicswill generate "frictional fingers" of air coated by a region ofdensely packed grains. The fingers have a characteristic width thatbalances surface tension and frictional forces of the densely packedgrains. When these fingers grow under the influence of gravity, theycan align either horizontally or vertically, or grow in a randomisotropic fashion. The transition between the different modes offinger growth depends on the density of grains, and the gravitationalforce component. We present an analytic model to account for thetransitions between the modes. We further present a numerical schemethat enables us to simulate the dynamics of the process. The numericaland analytic results are in good agreements with the experimentalfindings.Finally we show how this process could explain patterns that emergenaturally in early stages of dyke formation. These patterns areformed when hot fluid displaces partly molten rocks and packs the hardmineral grains composing it together, thereby forming fingerstructures that remain frozen in the dyke walls.</abstract><type>Conference Paper/Proceeding/Abstract</type><journal>Geophysical Research Abstracts 16, EGU2014-14715.</journal><volume>16</volume><publisher/><keywords>Pattern formation, Frictional fluids, gravity, frictional fingers</keywords><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2014</publishedYear><publishedDate>2014-12-31</publishedDate><doi/><url/><notes></notes><college>COLLEGE NANME</college><department>Chemical Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CHEG</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2016-08-04T14:14:41.2352305</lastEdited><Created>2015-05-13T10:21:12.3136751</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Chemical Engineering</level></path><authors><author><firstname>Jon Alm</firstname><surname>Eriksen</surname><order>1</order></author><author><firstname>Bjornar</firstname><surname>Sandnes</surname><orcid>0000-0002-4854-5857</orcid><order>2</order></author><author><firstname>Renaud</firstname><surname>Toussaint</surname><order>3</order></author><author><firstname>Knut Jorgen</firstname><surname>Maloy</surname><order>4</order></author><author><firstname>Eirik Grude</firstname><surname>Flekkoy</surname><order>5</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2016-08-04T14:14:41.2352305 v2 21347 2015-05-13 Gravity Induced Ordering of Frictional Fingers 61c7c04b5c804d9402caf4881e85234b 0000-0002-4854-5857 Bjornar Sandnes Bjornar Sandnes true false 2015-05-13 CHEG Experiments on confined two-phase flow systems, involving air and adense suspension, have revealed highly non-trivial flowmorphologies. As the air displaces the suspension, the grains thatmake up the suspension tend to accumulate along the interface, and canbuild up force chains that jam the accumulated region. This dynamicswill generate "frictional fingers" of air coated by a region ofdensely packed grains. The fingers have a characteristic width thatbalances surface tension and frictional forces of the densely packedgrains. When these fingers grow under the influence of gravity, theycan align either horizontally or vertically, or grow in a randomisotropic fashion. The transition between the different modes offinger growth depends on the density of grains, and the gravitationalforce component. We present an analytic model to account for thetransitions between the modes. We further present a numerical schemethat enables us to simulate the dynamics of the process. The numericaland analytic results are in good agreements with the experimentalfindings.Finally we show how this process could explain patterns that emergenaturally in early stages of dyke formation. These patterns areformed when hot fluid displaces partly molten rocks and packs the hardmineral grains composing it together, thereby forming fingerstructures that remain frozen in the dyke walls. Conference Paper/Proceeding/Abstract Geophysical Research Abstracts 16, EGU2014-14715. 16 Pattern formation, Frictional fluids, gravity, frictional fingers 31 12 2014 2014-12-31 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2016-08-04T14:14:41.2352305 2015-05-13T10:21:12.3136751 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Jon Alm Eriksen 1 Bjornar Sandnes 0000-0002-4854-5857 2 Renaud Toussaint 3 Knut Jorgen Maloy 4 Eirik Grude Flekkoy 5
title Gravity Induced Ordering of Frictional Fingers
spellingShingle Gravity Induced Ordering of Frictional Fingers
Bjornar Sandnes
title_short Gravity Induced Ordering of Frictional Fingers
title_full Gravity Induced Ordering of Frictional Fingers
title_fullStr Gravity Induced Ordering of Frictional Fingers
title_full_unstemmed Gravity Induced Ordering of Frictional Fingers
title_sort Gravity Induced Ordering of Frictional Fingers
author_id_str_mv 61c7c04b5c804d9402caf4881e85234b
author_id_fullname_str_mv 61c7c04b5c804d9402caf4881e85234b_***_Bjornar Sandnes
author Bjornar Sandnes
author2 Jon Alm Eriksen
Bjornar Sandnes
Renaud Toussaint
Knut Jorgen Maloy
Eirik Grude Flekkoy
format Conference Paper/Proceeding/Abstract
container_title Geophysical Research Abstracts 16, EGU2014-14715.
container_volume 16
publishDate 2014
institution Swansea University
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 0
active_str 0
description Experiments on confined two-phase flow systems, involving air and adense suspension, have revealed highly non-trivial flowmorphologies. As the air displaces the suspension, the grains thatmake up the suspension tend to accumulate along the interface, and canbuild up force chains that jam the accumulated region. This dynamicswill generate "frictional fingers" of air coated by a region ofdensely packed grains. The fingers have a characteristic width thatbalances surface tension and frictional forces of the densely packedgrains. When these fingers grow under the influence of gravity, theycan align either horizontally or vertically, or grow in a randomisotropic fashion. The transition between the different modes offinger growth depends on the density of grains, and the gravitationalforce component. We present an analytic model to account for thetransitions between the modes. We further present a numerical schemethat enables us to simulate the dynamics of the process. The numericaland analytic results are in good agreements with the experimentalfindings.Finally we show how this process could explain patterns that emergenaturally in early stages of dyke formation. These patterns areformed when hot fluid displaces partly molten rocks and packs the hardmineral grains composing it together, thereby forming fingerstructures that remain frozen in the dyke walls.
published_date 2014-12-31T03:25:18Z
_version_ 1763750883484499968
score 11.037275

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