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<identifier>oai:HAL:hal-00617674v1</identifier>
<datestamp>2018-01-11</datestamp>
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<setSpec>subject:sdu</setSpec>
<setSpec>subject:phys</setSpec>
<setSpec>subject:sde</setSpec>
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<metadata><dc>
<publisher>HAL CCSD</publisher>
<title lang=en>Effective non-local reaction kinetics for transport in physically and chemically heterogeneous media</title>
<creator>Dentz, Marco</creator>
<creator>Gouze, Philippe</creator>
<creator>Carrera, Jesus</creator>
<contributor>Institute of Environmental Assessment and Water Research (IDÆA-CSIC), Barcelona ; Université du Québec</contributor>
<contributor>Transferts en milieux poreux ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<source>ISSN: 0169-7722</source>
<source>Journal of Contaminant Hydrology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00617674</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00617674</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00617674</source>
<source>Journal of Contaminant Hydrology, Elsevier, 2011, 120-21, pp.222-236. 〈10.1016/j.jconhyd.2010.06.002〉</source>
<identifier>DOI : 10.1016/j.jconhyd.2010.06.002</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jconhyd.2010.06.002</relation>
<language>en</language>
<subject lang=en>Reactive transport</subject>
<subject lang=en>Multicontinuum models</subject>
<subject lang=en>Non-local transport</subject>
<subject lang=en>Non-local reaction</subject>
<subject lang=en>Matrix diffusion</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The correct characterization of the effective reactive transport dynamics is an important issue for modeling reactive transport on the Darcy scale, specifically in situations in which reactions are localized, that is when different reactions occur in different portions of the porous medium. Under such conditions the conventional approach of homogenizing only the porous medium chemistry is not appropriate. We consider here reactive transport in a porous medium that is characterized by mass transfer between a mobile and a distribution of immobile regions. Chemical and physical heterogeneities are reflected by distributions of kinetic reaction rate constants and residence times in the immobile zones. We derive an effective reactive transport equation for the mobile solute that is characterized by non-local physical mass transfer and reaction terms. Specifically, chemical heterogeneity is upscaled in terms of a reactive memory function that integrates both chemical and physical heterogeneity. Mass transfer limitations due to physical heterogeneity yield effective kinetic rate coefficients that can be much smaller than the volumetric average of the local scale coefficients. These results help to explain and quantify the often reported discrepancy between observed field reaction rate constants and the ones obtained under well mixed laboratory conditions. Furthermore, these results indicate that transport under physical and chemical heterogeneity cannot be upscaled separately.</description>
<date>2011</date>
</dc>
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