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Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials / DEREN OZTURK

Swansea University Author: DEREN OZTURK

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DOI (Published version): 10.23889/SUthesis.58577

Abstract

The conditions under which a mixture of water and grains will fracture like a solid, rather than flow like a liquid, is the subject of this thesis. Flow to fracture transitions in saturated granular materials are relevant to numerous geological and engineering environments, in-cluding magma cavern a...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Sandnes, Bjornar
URI: https://cronfa.swan.ac.uk/Record/cronfa58577
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first_indexed 2021-11-08T13:36:33Z
last_indexed 2021-11-09T04:26:00Z
id cronfa58577
recordtype RisThesis
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spelling 2021-11-08T15:08:33.5471879 v2 58577 2021-11-08 Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials b96146689d9b796f0e8d8b13149c3aaa DEREN OZTURK DEREN OZTURK true false 2021-11-08 The conditions under which a mixture of water and grains will fracture like a solid, rather than flow like a liquid, is the subject of this thesis. Flow to fracture transitions in saturated granular materials are relevant to numerous geological and engineering environments, in-cluding magma cavern activity, methane venting on seabeds, carbon dioxide storage, food processing, and innovations in body armour. To examine the flow to fracture transition, two systems are considered. The first is gas-driven fracturing of settled granular media, a slow creeping process that forms labyrinthine patterns. The second is gas-driven fractur-ing of suspended cornstarch particles, a system which exhibits fascinating “discontinuous shear thickening” behaviour, a topic of much debate in literature. Both systems are sub-ject to experiments within a Hele-Shaw cell, which enables the visualisation of pseudo-2D invasion flow or fracture patterns. Image analysis performed on these patterns led to the application of theories that can predict their behaviours. Fracture formation is found to be a friction dominated process. The invading pressure pushes on the local grains while surface tension of the receding water pulls on them until frictional forces become strong enough to maintain a front, forcing the pressure to disturb grains elsewhere, and in do-ing so extend and branch the fractures forming a patterned network. Various parameter studies are performed to uncover the variables that determine why a mixture might flow or fracture. Interestingly, the first system is found to transition from fracturing to flowing with increasing pressures, whilst the second system is found to do the opposite. E-Thesis Swansea Physics, Fluid Dynamics, Granular Flow, Non-Newtonian Fluid, Fracture, Invasion Pattern 8 11 2021 2021-11-08 10.23889/SUthesis.58577 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Sandnes, Bjornar Doctoral Ph.D Engineering and Physical Sciences Research Council and Ser Cymru National Research Network in Advanced Engineering 2021-11-08T15:08:33.5471879 2021-11-08T13:30:43.8814885 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised DEREN OZTURK 1 58577__21452__c0bb42497a3e4812af65e0e5254fdac2.pdf Ozturk_Deren_PhD_Thesis_Final_Redacted.pdf 2021-11-08T15:02:55.6689719 Output 53819965 application/pdf Redacted version - open access true Copyright: The author, Deren Ozturk, 2020. true eng
title Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
spellingShingle Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
DEREN OZTURK
title_short Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
title_full Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
title_fullStr Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
title_full_unstemmed Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
title_sort Pattern Formation and flow to Fracture Transitions in Granular and Sheer Thickening Materials
author_id_str_mv b96146689d9b796f0e8d8b13149c3aaa
author_id_fullname_str_mv b96146689d9b796f0e8d8b13149c3aaa_***_DEREN OZTURK
author DEREN OZTURK
author2 DEREN OZTURK
format E-Thesis
publishDate 2021
institution Swansea University
doi_str_mv 10.23889/SUthesis.58577
college_str Faculty of Science and Engineering
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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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The conditions under which a mixture of water and grains will fracture like a solid, rather than flow like a liquid, is the subject of this thesis. Flow to fracture transitions in saturated granular materials are relevant to numerous geological and engineering environments, in-cluding magma cavern activity, methane venting on seabeds, carbon dioxide storage, food processing, and innovations in body armour. To examine the flow to fracture transition, two systems are considered. The first is gas-driven fracturing of settled granular media, a slow creeping process that forms labyrinthine patterns. The second is gas-driven fractur-ing of suspended cornstarch particles, a system which exhibits fascinating “discontinuous shear thickening” behaviour, a topic of much debate in literature. Both systems are sub-ject to experiments within a Hele-Shaw cell, which enables the visualisation of pseudo-2D invasion flow or fracture patterns. Image analysis performed on these patterns led to the application of theories that can predict their behaviours. Fracture formation is found to be a friction dominated process. The invading pressure pushes on the local grains while surface tension of the receding water pulls on them until frictional forces become strong enough to maintain a front, forcing the pressure to disturb grains elsewhere, and in do-ing so extend and branch the fractures forming a patterned network. Various parameter studies are performed to uncover the variables that determine why a mixture might flow or fracture. Interestingly, the first system is found to transition from fracturing to flowing with increasing pressures, whilst the second system is found to do the opposite.
published_date 2021-11-08T04:15:13Z
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score 10.997866

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