+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Reactive transport in porous media: pore-network model approach compared to pore-scale model



Reactive transport in porous media: pore-network model approach compared to pore-scale model



Physical Review. E Statistical Nonlinear and Soft Matter Physics 87(2): 023010



Accurate determination of three macroscopic parameters governing reactive transport in porous media, namely, the apparent solute velocity, the dispersion, and the apparent reaction rate, is of key importance for predicting solute migration through reservoir aquifers. Two methods are proposed to calculate these parameters as functions of the Péclet and the Péclet-Dahmköhler numbers. In the first method called the pore-scale model (PSM), the porous medium is discretized by the level set method; the Stokes and convection-diffusion equations with reaction at the wall are solved by a finite-difference scheme. In the second method, called the pore-network model (PNM), the void space of the porous medium is represented by an idealized geometry of pore bodies joined by pore throats; the flow field is computed by solving Kirchhoff's laws and transport calculations are performed in the asymptotic regime where the solute concentration undergoes an exponential evolution with time. Two synthetic geometries of porous media are addressed by using both numerical codes. The first geometry is constructed in order to validate the hypotheses implemented in PNM. PSM is also used for a better understanding of the various reaction patterns observed in the asymptotic regime. Despite the PNM approximations, a very good agreement between the models is obtained, which shows that PNM is an accurate description of reactive transport. PNM, which can address much larger pore volumes than PSM, is used to evaluate the influence of the concentration distribution on macroscopic properties of a large irregular network reconstructed from microtomography images. The role of the dimensionless numbers and of the location and size of the largest pore bodies is highlighted.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 055387451

Download citation: RISBibTeXText

PMID: 23496613

DOI: 10.1103/physreve.87.023010


Related references

Lattice Boltzmann pore-scale model for multicomponent reactive transport in porous media. Journal of Geophysical Research: Solid Earth 111(B5): 0-0, 2006

An improved lattice Boltzmann model for multicomponent reactive transport in porous media at the pore scale. Water Resources Research 43(12): N/A-N/A, 2007

PoreFlow: A complex pore-network model for simulation of reactive transport in variably saturated porous media. Computers & Geosciences 61: 160-174, 2013

Pore network model of electrokinetic transport through charged porous media. Physical Review. E Statistical Nonlinear and Soft Matter Physics 89(4): 043013, 2014

Dynamic Pore-Scale Model of Drainage in Granular Porous Media: The Pore-Unit Assembly Method. Water Resources Research 54(6): 4193-4213, 2018

Pore-scale network model for three-phase flow in mixed-wet porous media. Physical Review. E Statistical Nonlinear and Soft Matter Physics 66(4 Pt 2): 046302, 2002

Dynamic pore-scale network model (PNM) of water imbibition in porous media. Advances in Water Resources 107: 191-211, 2017

Pore-scale modeling of capillary trapping in water-wet porous media: A new cooperative pore-body filling model. Advances in Water Resources 108: 1-14, 2017

Pore-scale network model for drainage-dominated three-phase flow in porous media. Transport in Porous Media 24(2): 167-201, 1996

A pore-scale network model for simulation of constitutive relationships in unsaturated porous media. Abstracts with Programs Geological Society of America: , Pages 285. 1994., 1994

Prediction of pore-scale transport properties in unconventional reservoirs using novel theoretical dendroidal pore-network model. Journal of Petroleum Science and Engineering 170: 712-720, 2018

Three-dimensional mixed-wet random pore-scale network modeling of two- and three-phase flow in porous media. I. Model description. Physical Review. E Statistical Nonlinear and Soft Matter Physics 71(2 Pt 2): 026301, 2005

Pore Network Modeling of Reactive Transport and Dissolution in Porous Media. Transport in Porous Media 113(2): 303-327, 2016

Review of pore network modelling of porous media: Experimental characterisations, network constructions and applications to reactive transport. Journal of Contaminant Hydrology 192: 101-117, 2016

Transport properties evolution of cement model system under degradation - Incorporation of a pore-scale approach into reactive transport modelling. Physics and Chemistry of the Earth, Parts A/B/C 99: 95-109, 2017