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Modeling the effect of flow-induced mechanical erosion during coffee filtration

Chaojie Mo, Richard Johnston Orcid Logo, Luciano Navarini, Marco Ellero

Physics of Fluids, Volume: 33, Issue: 9, Start page: 093101

Swansea University Authors: Richard Johnston Orcid Logo, Marco Ellero

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DOI (Published version): 10.1063/5.0059707

Abstract

The espresso extraction process involves a complex transport inside a geometry-changing porous medium. Large solid grains forming the majority of the porous medium can migrate, swell, and consolidate, and they can also morphologically change during flow, i.e., being mechanically eroded by hydrodynam...

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Published in: Physics of Fluids
ISSN: 1070-6631 1089-7666
Published: AIP Publishing 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57912
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first_indexed 2021-09-16T10:33:03Z
last_indexed 2021-10-06T03:22:37Z
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spelling 2021-10-05T16:56:53.7790758 v2 57912 2021-09-16 Modeling the effect of flow-induced mechanical erosion during coffee filtration 23282e7acce87dd926b8a62ae410a393 0000-0003-1977-6418 Richard Johnston Richard Johnston true false 84f2af0791d38bdbf826728de7e5c69d Marco Ellero Marco Ellero true false 2021-09-16 MTLS The espresso extraction process involves a complex transport inside a geometry-changing porous medium. Large solid grains forming the majority of the porous medium can migrate, swell, and consolidate, and they can also morphologically change during flow, i.e., being mechanically eroded by hydrodynamic forces. These processes can, in turn, have a significant back-effect on the flow and the related coffee extraction profiles. In this article, we devise a bottom–up erosion model in the framework of smoothed dissipative particle dynamics to consider flow-induced morphological changes of the coffee grains. We assume that the coffee grains are not completely wetted and remain brittle. We found that heterogeneity in both the filtration direction and the transverse direction can be induced. The former is controlled by the angle of internal friction while the latter is controlled by both the cohesion parameter and the angle of internal friction. Not restricted to the modeling of espresso extraction, our model can also be applied to other eroding porous media. Our results suggest that, under ideal porous flow conditions, we can control the heterogeneity (in both the pressure drop direction and the transverse direction) of an eroding medium by tuning the yield characteristics of the eroding material. Journal Article Physics of Fluids 33 9 093101 AIP Publishing 1070-6631 1089-7666 7 9 2021 2021-09-07 10.1063/5.0059707 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-10-05T16:56:53.7790758 2021-09-16T11:30:05.2450807 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Chaojie Mo 1 Richard Johnston 0000-0003-1977-6418 2 Luciano Navarini 3 Marco Ellero 4 57912__20869__84fcf87a8f8542e8a1a9e9fd996e9fc5.pdf 57912.pdf 2021-09-16T11:32:22.4950582 Output 26047376 application/pdf Accepted Manuscript true https://creativecommons.org/licenses/by-nc-nd/2.0/ true eng https://creativecommons.org/licenses/by-nc-nd/2.0/
title Modeling the effect of flow-induced mechanical erosion during coffee filtration
spellingShingle Modeling the effect of flow-induced mechanical erosion during coffee filtration
Richard Johnston
Marco Ellero
title_short Modeling the effect of flow-induced mechanical erosion during coffee filtration
title_full Modeling the effect of flow-induced mechanical erosion during coffee filtration
title_fullStr Modeling the effect of flow-induced mechanical erosion during coffee filtration
title_full_unstemmed Modeling the effect of flow-induced mechanical erosion during coffee filtration
title_sort Modeling the effect of flow-induced mechanical erosion during coffee filtration
author_id_str_mv 23282e7acce87dd926b8a62ae410a393
84f2af0791d38bdbf826728de7e5c69d
author_id_fullname_str_mv 23282e7acce87dd926b8a62ae410a393_***_Richard Johnston
84f2af0791d38bdbf826728de7e5c69d_***_Marco Ellero
author Richard Johnston
Marco Ellero
author2 Chaojie Mo
Richard Johnston
Luciano Navarini
Marco Ellero
format Journal article
container_title Physics of Fluids
container_volume 33
container_issue 9
container_start_page 093101
publishDate 2021
institution Swansea University
issn 1070-6631
1089-7666
doi_str_mv 10.1063/5.0059707
publisher AIP Publishing
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 The espresso extraction process involves a complex transport inside a geometry-changing porous medium. Large solid grains forming the majority of the porous medium can migrate, swell, and consolidate, and they can also morphologically change during flow, i.e., being mechanically eroded by hydrodynamic forces. These processes can, in turn, have a significant back-effect on the flow and the related coffee extraction profiles. In this article, we devise a bottom–up erosion model in the framework of smoothed dissipative particle dynamics to consider flow-induced morphological changes of the coffee grains. We assume that the coffee grains are not completely wetted and remain brittle. We found that heterogeneity in both the filtration direction and the transverse direction can be induced. The former is controlled by the angle of internal friction while the latter is controlled by both the cohesion parameter and the angle of internal friction. Not restricted to the modeling of espresso extraction, our model can also be applied to other eroding porous media. Our results suggest that, under ideal porous flow conditions, we can control the heterogeneity (in both the pressure drop direction and the transverse direction) of an eroding medium by tuning the yield characteristics of the eroding material.
published_date 2021-09-07T04:14:00Z
_version_ 1763753947674181632
score 11.035655

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