Convective dissolution of CO2 in saline aquifers: Progress in modeling and experiments

Density profiles around A+B→C reaction-diffusion fronts in partially miscible systems: A general classification

“…Although this study is valid for any orientation of the z axis with regard to gravity, Fig. 1 illustrates the special case where the interface is at the top of the host phase, which is for instance the case in the convective dissolution of CO 2 into brine during CO 2 sequestration [6,7,[12][13][14]. The host phase contains a dissolved reactant B in initial concentration B 0 .…”

“…The study of partially miscible stratifications has recently gained interest due to its relevance for groundwater management [1,2], enhanced oil recovery [3][4][5] or carbon dioxide (CO 2 ) sequestration [5][6][7][8][9][10][11][12][13][14]. Such stratifications are typically composed of a reservoir phase A dissolving with a finite solubility into a host phase, containing chemicals that may react with A.…”

Subsurface geochemical fate and effects of impurities contained in a CO2 stream injected into a deep saline aquifer: What is known

“…Zone III can be divided into a zone underneath the CO 2 plume (Zone IIIa) and a zone areally outside the CO 2 plume (Zone IIIb). While no CO 2 and/or associated impurities are present in Zone IIIb, dissolved injection stream derived components may be present in Zone IIIa as a result of gas dissolution at the interface between the gas plume and formation water, and, potentially as a result of convective mixing (see Emami-Meybodi et al, 2015) These zones are not static. The shape and extent of these zones depend on the amount of gas injected and the horizontal and lateral forces acting on the migrating phases.…”

Onset of Convection in the Presence of a Precipitation Reaction in a Porous Medium: A Comparison of Linear Stability and Numerical Approaches

“…The reason for this discrepancy between the linear and non-linear results has been explained by previous researchers for inert systems. For inert systems, it was shown that following the onset of motion, the Fickian diffusion continues to dominate for a substantial period of time, with convective fingers being almost imperceptible until the perturbations are considerably large to cause a significant increase in the rate of solute dissolution at the top interface [16,17]. This time corresponds to the onset time of non-linear instability [18].…”

“…Considering Equations (14) and (15) in the limit of zero wave number, and using Expression (17), it can be shown that the first mode, ψ 1 = η exp −η 2 , decays at the slowest rate, compared to the other modes, and is therefore considered the dominant mode, following Riaz et al [10]. Considering only the dominant mode, the perturbation concentration becomes: where A 1 is a function of time.…”