Two-Dimensional Modeling of the NAPL Dissolution in Porous Media: Heterogeneities Effects on the Large Scale Permeabilities and Mass Exchange Coefficient

Autor:	Dominique Nkounkou Tomodiatounga, Timothée Nsongo, Bernard Mabiala, Dominique Nganga, Christian Tathy
Rok vydání:	2017
Předmět:	geography geography.geographical_feature_category Scale (ratio) Chemistry Dimensional modeling Aquifer General Medicine Mechanics Physics::Geophysics Physics::Fluid Dynamics Phase (matter) Geotechnical engineering Limit (mathematics) Porous medium Relative permeability Dissolution
Zdroj:	Computational Water, Energy, and Environmental Engineering. :56-78
ISSN:	2168-1570 2168-1562
DOI:	10.4236/cweee.2017.61005
Popis:	In this paper, we are interested by the dissolution of NAPL (Non-Aqueous Phase Liquid) contaminants in heterogeneous soils or aquifers. The volume averaging technique is applied to 2D systems with Darcy-scale heterogeneities. A large-scale model is derived from a Darcy-scale dissolution model in the case of small and large Damkholer numbers, i.e., for smooth or sharp dissolution fronts. The resulting models in both cases have the mathematical structure of a non-equilibrium dissolution model. It is shown how to calculate the resulting mass exchange and relative permeability terms from the Darcy-scale heterogeneities and other fluid properties. One of the important finding is that the obtained values have a very different behavior compared to the Darcy-scale usual correlations. The large scale correlations are also very different between the two limit cases. The resulting large-scale models are compared favorably to Darcy-scale direct simulations.
Databáze:	OpenAIRE
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