Imperial College London
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DrBrankoBijeljic

Faculty of Engineering, Department of Earth Science & Engineering

Principal Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 6420b.bijeljic

 
 
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Location

 

2.53Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Oliveira:2020:10.1029/2020WR027317,
author = {Oliveira, TDS and Blunt, M and Bijeljic, B},
doi = {10.1029/2020WR027317},
journal = {Water Resources Research},
title = {Multispecies reactive transport in a microporous rock: impact of flow heterogeneity and reversibility of reaction},
url = {http://dx.doi.org/10.1029/2020WR027317},
volume = {56},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We study the impact of pore space heterogeneity on mixing and reaction in porous media. We simulate the parallel injection of two streams of reactants at different pH in a three-dimensional microporous consolidated rock whose pore space was resolved by differential micro-CT imaging. As an exemplar of a heterogeneous medium, we consider the pore structure obtained from a Portland carbonate sample. We use direct numerical simulation to study the coupled impact of flow heterogeneity, characterized by a wide distribution of velocities, and chemical reversibility on multispecies reaction. The flow field is found from the Darcy-Brinkman equation while the advection-diffusion equation describes transport, which is coupled to a general multispecies geochemical solver for homogeneous reactions; precipitation and dissolution are ignored.We observe a highly non-uniform spatial distribution of concentration and rates of formation and consumption. For advection-dominated transport, the heterogeneous flow field leads to significant transverse mixing in macropores at early times, followed by a slower mixing driven by diffusion between macro- and micropore regions. The effective rates of formation and consumption are species-dependent and distinct in macro- and microporosity: while some species reach an asymptotic rate in well-mixed regions, others still show a transient non-monotonic behaviour as a consequence of incomplete mixing. Our findings have important implications for the understanding of time- and space-dependent reaction rate behaviour: the coupled impact of pore space heterogeneity and reversible reactions need to be taken into account as key determinants to describe multispecies reactive transport.
AU  - Oliveira,TDS
AU  - Blunt,M
AU  - Bijeljic,B
DO  - 10.1029/2020WR027317
PY  - 2020///
SN  - 0043-1397
TI  - Multispecies reactive transport in a microporous rock: impact of flow heterogeneity and reversibility of reaction
T2  - Water Resources Research
UR  - http://dx.doi.org/10.1029/2020WR027317
UR  - http://hdl.handle.net/10044/1/85035
VL  - 56
ER  -
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