Electrical Signatures of Diffusion-Limited Mixing: Insights from a Milli-fluidic Tracer Experiment

Détails

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Etat: Public
Version: de l'auteur
Licence: CC BY 4.0
ID Serval
serval:BIB_80C5597FAFA6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Electrical Signatures of Diffusion-Limited Mixing: Insights from a Milli-fluidic Tracer Experiment
Périodique
Transport in Porous Media
Auteur(s)
Fernandez Visentini Alejandro, de Anna Pietro, Jougnot Damien, Le Borgne Tanguy, Méheust Yves, Linde Niklas
ISSN
0169-3913
1573-1634
Statut éditorial
Publié
Date de publication
24/05/2021
Langue
anglais
Résumé
We investigate how diffusion-limited mixing of a layered solute concentration distribution within a porous medium impacts bulk electrical conductivity. To do so, we perform a milli-fluidic tracer test by injecting a fluorescent and electrically conductive tracer in a quasi two-dimensional (2D) water-saturated porous medium. High resolution optical- and geoelectrical monitoring of the tracer is achieved by using a fluorimetry technique and equipping the flow cell with a resistivity meter, respectively. We find that optical and geoelectrical outputs can be related by a temporal re-scaling that accounts for the different diffusion rates of the optical and electrical tracers. Mixing-driven perturbations of the electrical equipotential field lines cause apparent electrical conductivity time-series, measured perpendicularly to the layering, to peak at times that are in agreement with the diffusion transport time-scale associated with the layer width. Numerical simulations highlight high sensitivity of such electrical data to the layers’ degree of mixing and their distance to the injection electrodes. Furthermore, the electrical data correlate well with time-series of two commonly used solute mixing descriptors: the concentration variance and the scalar dissipation rate.
Mots-clé
General Chemical Engineering, Catalysis
Web of science
Open Access
Oui
Financement(s)
Fonds national suisse / Projets / 184574
Fonds national suisse / Projets / 172587
Commission Européenne / H2020 / 722028
Création de la notice
01/06/2021 9:18
Dernière modification de la notice
02/06/2021 7:10
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