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    Numerical investigation of nanoparticles transport in anisotropic porous media

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    Type
    Article
    Authors
    Salama, Amgad cc
    Negara, Ardiansyah cc
    El-Amin, Mohamed cc
    Sun, Shuyu cc
    KAUST Department
    Computational Transport Phenomena Lab
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-07-13
    Online Publication Date
    2015-07-13
    Print Publication Date
    2015-10
    Permanent link to this record
    http://hdl.handle.net/10754/560566
    
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    Abstract
    In this work the problem related to the transport of nanoparticles in anisotropic porous media is investigated numerically using the multipoint flux approximation. Anisotropy of porous media properties are an essential feature that exist almost everywhere in subsurface formations. In anisotropic media, the flux and the pressure gradient vectors are no longer collinear and therefore interesting patterns emerge. The transport of nanoparticles in subsurface formations is affected by several complex processes including surface charges, heterogeneity of nanoparticles and soil grain collectors, interfacial dynamics of double-layer and many others. We use the framework of the theory of filtration in this investigation. Processes like particles deposition, entrapment, as well as detachment are accounted for. From the numerical methods point of view, traditional two-point flux finite difference approximation cannot handle anisotropy of media properties. Therefore, in this work we use the multipoint flux approximation (MPFA). In this technique, the flux components are affected by more neighboring points as opposed to the mere two points that are usually used in traditional finite volume methods. We also use the experimenting pressure field approach which automatically constructs the global system of equations by solving multitude of local problems. This approach facilitates to a large extent the construction of the global system. A set of numerical examples is considered involving two-dimensional rectangular domain. A source of nanoparticles is inserted in the middle of the anisotropic layer. We investigate the effects of both anisotropy angle and anisotropy ratio on the transport of nanoparticles in saturated porous media. It is found that the concentration plume and porosity contours follow closely the principal direction of anisotropy of permeability of the central domain.
    Citation
    Numerical investigation of nanoparticles transport in anisotropic porous media 2015 Journal of Contaminant Hydrology
    Publisher
    Elsevier BV
    Journal
    Journal of Contaminant Hydrology
    DOI
    10.1016/j.jconhyd.2015.06.010
    PubMed ID
    26212784
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0169772215300036
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jconhyd.2015.06.010
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program; Computational Transport Phenomena Lab

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