Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media

Abstract Increasing salinity in groundwater and soil poses a threat to water and land resources. With the expectation of major changes to the hydrological cycle through climate change, the need for understanding the fundamental processes governing solute transport through soil has grown significantl...

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Autores principales:	Salomé M. S. Shokri-Kuehni, Mina Bergstad, Muhammad Sahimi, Colin Webb, Nima Shokri
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9fc551b829bf4378b4e1c96201014711
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spelling	oai:doaj.org-article:9fc551b829bf4378b4e1c962010147112021-12-02T15:09:12ZIodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media10.1038/s41598-018-29115-02045-2322https://doaj.org/article/9fc551b829bf4378b4e1c962010147112018-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-29115-0https://doaj.org/toc/2045-2322Abstract Increasing salinity in groundwater and soil poses a threat to water and land resources. With the expectation of major changes to the hydrological cycle through climate change, the need for understanding the fundamental processes governing solute transport through soil has grown significantly. We provide experimentally verified insights into the influence of particle size distribution on solute transport in porous media during evaporation at the pore- and macro-scales. To do so, we utilized four-dimensional (space plus time) synchrotron X-ray tomography for iodine k-edge dual energy imaging to obtain solute concentration profiles in every single pore during saline water evaporation from coarse- and fine-grained sands. Close to the surface of the coarse-grained sand significantly higher salt concentrations were observed when compared to fine-grained sand with the same porosity under similar cumulative evaporative mass losses. The physics behind this behaviour was delineated using the recorded data with high spatial and temporal resolutions. Moreover, the measured data enabled us to quantify the variations of the effective dispersion coefficient during evaporation and how it is influenced by the particle size distribution. We show that, contrary to common assumption in modelling of solute transport during evaporation, the effective dispersion coefficient varies as a function of liquid saturation and the length of the invaded zone during evaporation from porous media, and that it increases as liquid saturation decreases.Salomé M. S. Shokri-KuehniMina BergstadMuhammad SahimiColin WebbNima ShokriNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Salomé M. S. Shokri-Kuehni Mina Bergstad Muhammad Sahimi Colin Webb Nima Shokri Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
description	Abstract Increasing salinity in groundwater and soil poses a threat to water and land resources. With the expectation of major changes to the hydrological cycle through climate change, the need for understanding the fundamental processes governing solute transport through soil has grown significantly. We provide experimentally verified insights into the influence of particle size distribution on solute transport in porous media during evaporation at the pore- and macro-scales. To do so, we utilized four-dimensional (space plus time) synchrotron X-ray tomography for iodine k-edge dual energy imaging to obtain solute concentration profiles in every single pore during saline water evaporation from coarse- and fine-grained sands. Close to the surface of the coarse-grained sand significantly higher salt concentrations were observed when compared to fine-grained sand with the same porosity under similar cumulative evaporative mass losses. The physics behind this behaviour was delineated using the recorded data with high spatial and temporal resolutions. Moreover, the measured data enabled us to quantify the variations of the effective dispersion coefficient during evaporation and how it is influenced by the particle size distribution. We show that, contrary to common assumption in modelling of solute transport during evaporation, the effective dispersion coefficient varies as a function of liquid saturation and the length of the invaded zone during evaporation from porous media, and that it increases as liquid saturation decreases.
format	article
author	Salomé M. S. Shokri-Kuehni Mina Bergstad Muhammad Sahimi Colin Webb Nima Shokri
author_facet	Salomé M. S. Shokri-Kuehni Mina Bergstad Muhammad Sahimi Colin Webb Nima Shokri
author_sort	Salomé M. S. Shokri-Kuehni
title	Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
title_short	Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
title_full	Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
title_fullStr	Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
title_full_unstemmed	Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
title_sort	iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/9fc551b829bf4378b4e1c96201014711
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Iodine k-edge dual energy imaging reveals the influence of particle size distribution on solute transport in drying porous media

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