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Tortuosity of porous media: Image analysis and physical simulation

Jinlong Fu, Hywel Thomas Orcid Logo, Chenfeng Li Orcid Logo

Earth-Science Reviews, Volume: 212, Start page: 103439

Swansea University Authors: Hywel Thomas Orcid Logo, Chenfeng Li Orcid Logo

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DOI (Published version): 10.1016/j.earscirev.2020.103439

Abstract

Tortuosity is widely used as a critical parameter to predict transport properties of porous media, such as rocks and soils. But unlike other standard microstructural properties, the concept of tortuosity is vague with multiple definitions and various evaluation methods introduced in different contex...

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Published in: Earth-Science Reviews
ISSN: 0012-8252
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa55808
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spelling 2021-12-02T11:27:01.6339107 v2 55808 2020-12-03 Tortuosity of porous media: Image analysis and physical simulation 08ebc76b093f3e17fed29281f5cb637e 0000-0002-3951-0409 Hywel Thomas Hywel Thomas true false 82fe170d5ae2c840e538a36209e5a3ac 0000-0003-0441-211X Chenfeng Li Chenfeng Li true false 2020-12-03 CIVL Tortuosity is widely used as a critical parameter to predict transport properties of porous media, such as rocks and soils. But unlike other standard microstructural properties, the concept of tortuosity is vague with multiple definitions and various evaluation methods introduced in different contexts. Hydraulic, electrical, diffusional, and thermal tortuosities are defined to describe different transport processes in porous media, while geometrical tortuosity is introduced to characterize the morphological property of porous microstructures. In particular, the rapid development of microscopy imaging techniques has made digital microstructures of porous media increasingly accessible, from which geometrical and physical tortuosities can be evaluated using various image analysis and numerical simulation methods. These tortuosities are defined differently and can differ greatly in value, but in many works of literature, they are used interchangeably. To address this situation, we systematically examine geometrical, hydraulic, electrical, diffusional, and thermal tortuosities from the viewpoints of the definition and evaluation method. For the same porous medium, visible discrepancies are found in the evaluated geometrical and physical tortuosities, depending on the specific definition and the evaluation method adopted. This observation makes it questionable to directly use the geometrical tortuosity as a substitute for physical tortuosities, a common practice in the literature. Thus, the correlations between geometrical and physical tortuosities are further analyzed, which also takes into account the influence of both image size and resolution. From the correlation analysis, phenomenological relations between geometrical and physical tortuosities are established, so that the latter can be accurately predicted by using the former which is much cheaper to evaluate from digital microstructures. Journal Article Earth-Science Reviews 212 103439 Elsevier BV 0012-8252 Tortuosity; Porous media; Image analysis; Numerical simulation; Microstructural characteristic; Transport property 1 1 2021 2021-01-01 10.1016/j.earscirev.2020.103439 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2021-12-02T11:27:01.6339107 2020-12-03T09:38:50.6647137 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Jinlong Fu 1 Hywel Thomas 0000-0002-3951-0409 2 Chenfeng Li 0000-0003-0441-211X 3 55808__18817__4aeefe32b0ee4ae7993bff0531362902.pdf 55808.pdf 2020-12-04T10:37:02.5688447 Output 32976983 application/pdf Accepted Manuscript true 2021-11-27T00:00:00.0000000 ©2020 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Tortuosity of porous media: Image analysis and physical simulation
spellingShingle Tortuosity of porous media: Image analysis and physical simulation
Hywel Thomas
Chenfeng Li
title_short Tortuosity of porous media: Image analysis and physical simulation
title_full Tortuosity of porous media: Image analysis and physical simulation
title_fullStr Tortuosity of porous media: Image analysis and physical simulation
title_full_unstemmed Tortuosity of porous media: Image analysis and physical simulation
title_sort Tortuosity of porous media: Image analysis and physical simulation
author_id_str_mv 08ebc76b093f3e17fed29281f5cb637e
82fe170d5ae2c840e538a36209e5a3ac
author_id_fullname_str_mv 08ebc76b093f3e17fed29281f5cb637e_***_Hywel Thomas
82fe170d5ae2c840e538a36209e5a3ac_***_Chenfeng Li
author Hywel Thomas
Chenfeng Li
author2 Jinlong Fu
Hywel Thomas
Chenfeng Li
format Journal article
container_title Earth-Science Reviews
container_volume 212
container_start_page 103439
publishDate 2021
institution Swansea University
issn 0012-8252
doi_str_mv 10.1016/j.earscirev.2020.103439
publisher Elsevier BV
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 Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
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description Tortuosity is widely used as a critical parameter to predict transport properties of porous media, such as rocks and soils. But unlike other standard microstructural properties, the concept of tortuosity is vague with multiple definitions and various evaluation methods introduced in different contexts. Hydraulic, electrical, diffusional, and thermal tortuosities are defined to describe different transport processes in porous media, while geometrical tortuosity is introduced to characterize the morphological property of porous microstructures. In particular, the rapid development of microscopy imaging techniques has made digital microstructures of porous media increasingly accessible, from which geometrical and physical tortuosities can be evaluated using various image analysis and numerical simulation methods. These tortuosities are defined differently and can differ greatly in value, but in many works of literature, they are used interchangeably. To address this situation, we systematically examine geometrical, hydraulic, electrical, diffusional, and thermal tortuosities from the viewpoints of the definition and evaluation method. For the same porous medium, visible discrepancies are found in the evaluated geometrical and physical tortuosities, depending on the specific definition and the evaluation method adopted. This observation makes it questionable to directly use the geometrical tortuosity as a substitute for physical tortuosities, a common practice in the literature. Thus, the correlations between geometrical and physical tortuosities are further analyzed, which also takes into account the influence of both image size and resolution. From the correlation analysis, phenomenological relations between geometrical and physical tortuosities are established, so that the latter can be accurately predicted by using the former which is much cheaper to evaluate from digital microstructures.
published_date 2021-01-01T04:10:17Z
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