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A generalised model for electro-osmotic flow in porous media

Simona Di Fraia, P. Nithiarasu, Perumal Nithiarasu Orcid Logo

International Journal of Numerical Methods for Heat & Fluid Flow, Volume: ahead-of-print, Issue: ahead-of-print

Swansea University Author: Perumal Nithiarasu Orcid Logo

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DOI (Published version): 10.1108/HFF-03-2019-0192

Abstract

PurposeThis study aims at developing a comprehensive model for the analysis of electro-osmotic flow (EOF) through a fluid-saturated porous medium. To fully understand and exploit a number of applications, such a model for EOF through porous media is essential.Design/methodology/approachThe proposed...

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Published in: International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50911
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first_indexed 2019-06-24T20:54:07Z
last_indexed 2019-09-10T15:28:55Z
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spelling 2019-09-10T13:36:13.4529888 v2 50911 2019-06-24 A generalised model for electro-osmotic flow in porous media 3b28bf59358fc2b9bd9a46897dbfc92d 0000-0002-4901-2980 Perumal Nithiarasu Perumal Nithiarasu true false 2019-06-24 CIVL PurposeThis study aims at developing a comprehensive model for the analysis of electro-osmotic flow (EOF) through a fluid-saturated porous medium. To fully understand and exploit a number of applications, such a model for EOF through porous media is essential.Design/methodology/approachThe proposed model is based on a generalised set of governing equations used for modelling flow through fluid saturated porous media. These equations are modified to incorporate appropriate modifications to represent electro-osmosis (EO). The model is solved through the finite element method (FEM). The validity of the proposed numerical model is demonstrated by comparing the numerical results of internal potential and velocity distribution with corresponding analytical expressions. The model introduced is also used to carry out a sensitivity analysis of the main parameters that control EOF.FindingsThe analysis carried out confirms that EO in free channels without porous obstruction is effective only at small scales, as largely discussed in the available literature. Using porous media makes EO independent of the channel scale. Indeed, as the channel size increases, the presence of the charged porous medium is essential to induce fluid flow. Moreover, results demonstrate that flow is significantly affected by the characteristics of the porous medium, such as particle size, and by the zeta potential acting on the charged surfaces.Originality/valueTo the best of the authors’ knowledge, a comprehensive FEM model, based on the generalised equations to simulate EOF in porous media, is proposed here for the first time. Journal Article International Journal of Numerical Methods for Heat & Fluid Flow ahead-of-print ahead-of-print 0961-5539 31 12 2019 2019-12-31 10.1108/HFF-03-2019-0192 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2019-09-10T13:36:13.4529888 2019-06-24T14:29:26.0812585 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Simona Di Fraia 1 P. Nithiarasu 2 Perumal Nithiarasu 0000-0002-4901-2980 3 0050911-24062019143845.pdf difraia2019.pdf 2019-06-24T14:38:45.8730000 Output 14983166 application/pdf Accepted Manuscript true 2019-08-02T00:00:00.0000000 false eng
title A generalised model for electro-osmotic flow in porous media
spellingShingle A generalised model for electro-osmotic flow in porous media
Perumal Nithiarasu
title_short A generalised model for electro-osmotic flow in porous media
title_full A generalised model for electro-osmotic flow in porous media
title_fullStr A generalised model for electro-osmotic flow in porous media
title_full_unstemmed A generalised model for electro-osmotic flow in porous media
title_sort A generalised model for electro-osmotic flow in porous media
author_id_str_mv 3b28bf59358fc2b9bd9a46897dbfc92d
author_id_fullname_str_mv 3b28bf59358fc2b9bd9a46897dbfc92d_***_Perumal Nithiarasu
author Perumal Nithiarasu
author2 Simona Di Fraia
P. Nithiarasu
Perumal Nithiarasu
format Journal article
container_title International Journal of Numerical Methods for Heat & Fluid Flow
container_volume ahead-of-print
container_issue ahead-of-print
publishDate 2019
institution Swansea University
issn 0961-5539
doi_str_mv 10.1108/HFF-03-2019-0192
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 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
document_store_str 1
active_str 0
description PurposeThis study aims at developing a comprehensive model for the analysis of electro-osmotic flow (EOF) through a fluid-saturated porous medium. To fully understand and exploit a number of applications, such a model for EOF through porous media is essential.Design/methodology/approachThe proposed model is based on a generalised set of governing equations used for modelling flow through fluid saturated porous media. These equations are modified to incorporate appropriate modifications to represent electro-osmosis (EO). The model is solved through the finite element method (FEM). The validity of the proposed numerical model is demonstrated by comparing the numerical results of internal potential and velocity distribution with corresponding analytical expressions. The model introduced is also used to carry out a sensitivity analysis of the main parameters that control EOF.FindingsThe analysis carried out confirms that EO in free channels without porous obstruction is effective only at small scales, as largely discussed in the available literature. Using porous media makes EO independent of the channel scale. Indeed, as the channel size increases, the presence of the charged porous medium is essential to induce fluid flow. Moreover, results demonstrate that flow is significantly affected by the characteristics of the porous medium, such as particle size, and by the zeta potential acting on the charged surfaces.Originality/valueTo the best of the authors’ knowledge, a comprehensive FEM model, based on the generalised equations to simulate EOF in porous media, is proposed here for the first time.
published_date 2019-12-31T04:02:36Z
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score 10.997933

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