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231226s2024 xx |||||o 00| ||eng c |
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|a 10.1111/gwat.13328
|2 doi
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|e rakwb
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|a eng
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|a Dorchester, Leland
|e verfasserin
|4 aut
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|a Evaluation of Dual Domain Mass Transfer in Porous Media at the Pore Scale
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 06.03.2024
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|a Date Revised 03.08.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2023 National Ground Water Association.
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|a Dual-porosity models are often used to describe solute transport in heterogeneous media, but the parameters within these models (e.g., immobile porosity and mobile/immobile exchange rate coefficients) are difficult to identify experimentally or relate to measurable quantities. Here, we performed synthetic, pore-scale millifluidics simulations that coupled fluid flow, solute transport, and electrical resistivity (ER). A conductive-tracer test and the associated geoelectrical signatures were simulated for four flow rates in two distinct pore-scale model scenarios: one with intergranular porosity, and a second with an intragranular porosity also defined. With these models, we explore how the effective characteristic-length scale estimated from a best-fit dual-domain mass transfer (DDMT) model compares to geometric aspects of the flow field. In both model scenarios we find that: (1) mobile domains and immobile domains develop even in a system that is explicitly defined with one domain; (2) the ratio of immobile to mobile porosity is larger at faster flow rates as is the mass-transfer rate; and (3) a comparison of length scales associated with the mass-transfer rate (Lα ) and those associated with calculation of the Peclet number (LPe ) show LPe is commonly larger than Lα . These results suggest that estimated immobile porosities from a DDMT model are not only a function of physically mobile or immobile pore space, but also are a function of the average linear pore-water velocity and physical obstructions to flow, which can drive the development of immobile porosity even in single-porosity domains
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|a Journal Article
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Water Pollutants, Chemical
|2 NLM
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|a Solutions
|2 NLM
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|a Day-Lewis, Frederick D
|e verfasserin
|4 aut
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|a Singha, Kamini
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Ground water
|d 1979
|g 62(2024), 2 vom: 03. März, Seite 260-275
|w (DE-627)NLM098182528
|x 1745-6584
|7 nnns
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| 773 |
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|g volume:62
|g year:2024
|g number:2
|g day:03
|g month:03
|g pages:260-275
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|u http://dx.doi.org/10.1111/gwat.13328
|3 Volltext
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