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Reactive Transport and Mixing in Heterogeneous Media: Chemical Random Walks under Local Non-equilibrium

Descripción del proyecto

Modelización del transporte reactivo en medios porosos heterogéneos a escalas múltiples

Comprender y modelizar el transporte reactivo en medios porosos es fundamental para predecir reacciones biogeoquímicas a escala de campo, que desempeñan una función crucial en problemas ambientales actuales como la gestión de recursos hídricos y la captura de dióxido de carbono. Determinar la dinámica de los procesos acoplados de mezclas de solutos y reacciones químicas en medios porosos heterogéneos a múltiples escalas espaciales constituye un gran reto científico. El proyecto ChemicalWalks, financiado por las Acciones Marie Skłodowska-Curie, abordará este desafío uniendo por primera vez la teoría de la mezcla de laminillas y el modelo químico de paseos aleatorios en tiempo continuo para la cinética de reacción en mezclas incompletas.

Objetivo

Understanding and modelling reactive transport in porous media is fundamental to predicting field-scale biogeochemical reactions, which play a key role in current environmental issues such as water resources management and carbon dioxide sequestration. A major scientific challenge is to capture the dynamics of coupled solute mixing and reaction processes in the context of multiscale heterogeneity, which characterise most natural porous media. In particular, the impact of pore-scale mixing on large- (Darcy-)scale reactive transport is a critical scientific question. ChemicalWalks addresses this question by coupling for the first time the lamella theory of mixing, developed by the host supervisor, and the chemical CTRW model for reaction kinetics under incomplete mixing, recently developed by the ER. While the lamella theory has successfully quantified mixing processes and fluid-fluid reactions at pore scale, its application to fluid-solid reactions, which are ubiquitous in natural systems, remains to be explored. The key idea of ChemicalWalks is to use the lamella theory to determine how pore-scale concentration distributions control the distribution of fluid-solid reaction rates, and formalize a predictive theory for upscaled reaction kinetics through the chemical CTRW framework (WP1). The complementary expertise of the researcher and the host will ensure a particularly efficient two-way transfer of knowledge to achieve this goal. This will open the door to the development of a hybrid computational method, quantifying the effect of pore-scale mixing on Darcy-scale reactive transport phenomena at a scale relevant to environmental applications (WP2). ChemicalWalks will be firmly rooted on a career development plan and supported by scientific training in state-of-the-art mixing theories and data processing and interpretation techniques, placing the fellow at the forefront of reactive transport modelling.

Régimen de financiación

MSCA-IF-EF-ST - Standard EF

Coordinador

UNIVERSITE DE RENNES I
Aportación neta de la UEn
€ 184 707,84
Dirección
RUE DU THABOR 2
35065 RENNES CEDEX
Francia

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Región
Bretagne Bretagne Ille-et-Vilaine
Tipo de actividad
Higher or Secondary Education Establishments
Enlaces
Coste total
€ 184 707,84