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The transport of liquids in softwood: timber as a model porous medium

H. C. Burridge, G. Wu, T. Reynolds, D. U. Shah, Richard Johnston Orcid Logo, O. A. Scherman, M. H. Ramage, P. F. Linden

Scientific Reports, Volume: 9, Issue: 1

Swansea University Author: Richard Johnston Orcid Logo

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DOI (Published version): 10.1038/s41598-019-55811-6

Abstract

Timber is the only widely used construction material we can grow. The wood from which it comes has evolved to provide structural support for the tree and to act as a conduit for fluid flow. These flow paths are crucial for engineers to exploit the full potential of timber, by allowing impregnation w...

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Published in: Scientific Reports
ISSN: 2045-2322
Published: Springer Science and Business Media LLC 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa52918
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spelling 2020-11-20T08:57:46.2757835 v2 52918 2019-12-02 The transport of liquids in softwood: timber as a model porous medium 23282e7acce87dd926b8a62ae410a393 0000-0003-1977-6418 Richard Johnston Richard Johnston true false 2019-12-02 MTLS Timber is the only widely used construction material we can grow. The wood from which it comes has evolved to provide structural support for the tree and to act as a conduit for fluid flow. These flow paths are crucial for engineers to exploit the full potential of timber, by allowing impregnation with liquids that modify the properties or resilience of this natural material. Accurately predicting the transport of these liquids enables more efficient industrial timber treatment processes to be developed, thereby extending the scope to use this sustainable construction material; moreover, it is of fundamental scientific value — as a fluid flow within a natural porous medium. Both structural and transport properties of wood depend on its micro-structure but, while a substantial body of research relates the structural performance of wood to its detailed architecture, no such knowledge exists for the transport properties. We present a model, based on increasingly refined geometric parameters, that accurately predicts the time-dependent ingress of liquids within softwood timber, thereby addressing this long-standing scientific challenge. Moreover, we show that for the minimalistic parameterisation the model predicts ingress with a square-root-of-time behaviour. However, experimental data show a potentially significant departure from this t √ t behaviour — a departure which is successfully predicted by our more advanced parametrisation. Our parameterisation of the timber microstructure was informed by computed tomographic measurements; model predictions were validated by comparison with experimental data. We show that accurate predictions require statistical representation of the variability in the timber pore space. The collapse of our dimensionless experimental data demonstrates clear potential for our results to be up-scaled to industrial treatment processes. Journal Article Scientific Reports 9 1 Springer Science and Business Media LLC 2045-2322 30 12 2019 2019-12-30 10.1038/s41598-019-55811-6 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-11-20T08:57:46.2757835 2019-12-02T13:04:08.7240257 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering H. C. Burridge 1 G. Wu 2 T. Reynolds 3 D. U. Shah 4 Richard Johnston 0000-0003-1977-6418 5 O. A. Scherman 6 M. H. Ramage 7 P. F. Linden 8 52918__16221__a398e3edb30d49f4b7cc3224d373a071.pdf burridge2019.pdf 2020-01-07T14:24:49.0092951 Output 2533256 application/pdf Version of Record true © The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License true eng http://creativecommons.org/licenses/by/4.0/
title The transport of liquids in softwood: timber as a model porous medium
spellingShingle The transport of liquids in softwood: timber as a model porous medium
Richard Johnston
title_short The transport of liquids in softwood: timber as a model porous medium
title_full The transport of liquids in softwood: timber as a model porous medium
title_fullStr The transport of liquids in softwood: timber as a model porous medium
title_full_unstemmed The transport of liquids in softwood: timber as a model porous medium
title_sort The transport of liquids in softwood: timber as a model porous medium
author_id_str_mv 23282e7acce87dd926b8a62ae410a393
author_id_fullname_str_mv 23282e7acce87dd926b8a62ae410a393_***_Richard Johnston
author Richard Johnston
author2 H. C. Burridge
G. Wu
T. Reynolds
D. U. Shah
Richard Johnston
O. A. Scherman
M. H. Ramage
P. F. Linden
format Journal article
container_title Scientific Reports
container_volume 9
container_issue 1
publishDate 2019
institution Swansea University
issn 2045-2322
doi_str_mv 10.1038/s41598-019-55811-6
publisher Springer Science and Business Media LLC
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 - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description Timber is the only widely used construction material we can grow. The wood from which it comes has evolved to provide structural support for the tree and to act as a conduit for fluid flow. These flow paths are crucial for engineers to exploit the full potential of timber, by allowing impregnation with liquids that modify the properties or resilience of this natural material. Accurately predicting the transport of these liquids enables more efficient industrial timber treatment processes to be developed, thereby extending the scope to use this sustainable construction material; moreover, it is of fundamental scientific value — as a fluid flow within a natural porous medium. Both structural and transport properties of wood depend on its micro-structure but, while a substantial body of research relates the structural performance of wood to its detailed architecture, no such knowledge exists for the transport properties. We present a model, based on increasingly refined geometric parameters, that accurately predicts the time-dependent ingress of liquids within softwood timber, thereby addressing this long-standing scientific challenge. Moreover, we show that for the minimalistic parameterisation the model predicts ingress with a square-root-of-time behaviour. However, experimental data show a potentially significant departure from this t √ t behaviour — a departure which is successfully predicted by our more advanced parametrisation. Our parameterisation of the timber microstructure was informed by computed tomographic measurements; model predictions were validated by comparison with experimental data. We show that accurate predictions require statistical representation of the variability in the timber pore space. The collapse of our dimensionless experimental data demonstrates clear potential for our results to be up-scaled to industrial treatment processes.
published_date 2019-12-30T04:05:35Z
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score 11.035655

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