scholarly journals Reactive–convective dissolution in a porous medium: the storage of carbon dioxide in saline aquifers

2017 ◽  
Vol 19 (1) ◽  
pp. 644-655 ◽  
Author(s):  
Parama Ghoshal ◽  
Min Chan Kim ◽  
Silvana S. S. Cardoso
Keyword(s):  
Carbon Dioxide ◽  
Boundary Layer ◽  
Porous Medium ◽  
Saline Aquifers ◽  
Diffusive Boundary Layer ◽  
First Order ◽  
Order Chemical Reaction ◽  
Fingering Instability ◽  
Diffusive Boundary ◽  
First Order Chemical Reaction

We quantify the destabilising effect of a first-order chemical reaction on the fingering instability of a diffusive boundary layer in a porous medium.

The impact of geochemistry on convective mixing in a gravitationally unstable diffusive boundary layer in porous media: CO2 storage in saline aquifers

2011 ◽  
Vol 673 ◽  
pp. 480-512 ◽  
Author(s):  
KARIM GHESMAT ◽  
HASSAN HASSANZADEH ◽  
JALAL ABEDI
Keyword(s):  
Carbon Dioxide ◽  
Boundary Layer ◽  
Porous Media ◽  
Saline Aquifers ◽  
Diffusive Boundary Layer ◽  
Convective Mixing ◽  
Geochemical Reactions ◽  
Diffusive Boundary ◽  
The Stability ◽  
The Impact

The storage of carbon dioxide and acid gases in deep geological formations is considered a promising option for mitigation of greenhouse gas emissions. An understanding of the primary mechanisms such as convective mixing and geochemistry that affect the long-term geostorage process in deep saline aquifers is of prime importance. First, a linear stability analysis of an unstable diffusive boundary layer in porous media is presented, where the instability occurs due to a density difference between the carbon dioxide saturated brine and the resident brine. The impact of geochemical reactions on the stability of the boundary layer is examined. The equations are linearised, and the obtained system of eigenvalue problems is solved numerically. The linear stability results have revealed that geochemistry stabilises the boundary layer as reaction consumes the dissolved carbon dioxide and makes the density profile, as the source of instability, more uniform. A detailed physical discussion is also presented with an examination of vorticity and concentration eigenfunctions and streamlines' contours to reveal how the geochemical reaction may affect the hydrodynamics of the process. We also investigate the effects of the Rayleigh number and the diffusion time on the stability of a boundary layer coupled with geochemical reactions. Nonlinear direct numerical simulations are also presented, in which the evolution of density-driven instabilities for different reaction rates is discussed. The development of instability is precisely studied for various scenarios. The results indicate that the boundary layer will be more stable for systems with a higher rate of reaction. However, our quantitative analyses show that more carbon dioxide may be removed from the supercritical free phase as the measured flux at the boundary is always higher for flow systems coupled with stronger geochemical reactions.

scholarly journals MHD Boundary Layer Flow of Casson Fluid Past an Inclined Plate in the Presence of Soret/Dufour Effects, Heat Source and First-order Chemical Reaction

2021 ◽  
Vol 13 (3) ◽  
pp. 785-795
Author(s):  
U. J. Das
Keyword(s):  
Boundary Layer ◽  
Heat Source ◽  
Boundary Layer Flow ◽  
Casson Fluid ◽  
Inclined Plate ◽  
First Order ◽  
Order Chemical Reaction ◽  
Fluid Parameter ◽  
Layer Flow ◽  
First Order Chemical Reaction

The main objective of this study is to investigate the effects of the Casson fluid parameter on an incompressible, magnetohydrodynamic boundary layer flow of a Casson fluid past a moving porous inclined plate in the presence of heat source and first-order chemical reaction. The governing partial differential equations are converted into ordinary differential equations using similarity transformation and then are solved numerically, adopting bv4pc method. The effects of relevant parameters on the velocity, temperature and concentration profiles are analyzed graphically. Also, tabular form is used to present skin friction, heat transfer and mass transfer. This investigation reveals that the Casson fluid parameter enhances the fluid velocity, skin friction and Sherwood number, while the Nusselt number decreases.

scholarly journals Compressive Strength Properties of Snow

1959 ◽  
Vol 3 (25) ◽  
pp. 345-354
Author(s):  
H. H. G. Jellinek
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Compressive Strength ◽  
Chemical Reaction ◽  
Strength Properties ◽  
Measurable Effect ◽  
First Order ◽  
Order Chemical Reaction ◽  
Snow Particle ◽  
First Order Chemical Reaction

AbstractThe compressive strength of snow cylinders was investigated as a function of the age of the snow from which the cylinders were made, the snow particle size and the age of the cylinders. The results show that the compressive strength is reduced if the snow is older, if the particle size is smaller, or if the cylinders are younger. The variation with age of the cylinders can be represented by an equation similar to that for a first-order chemical reaction. The effect of adding small quantities of various gases to the atmosphere in which the cylinders were kept was also investigated; carbon dioxide and methane had no measurable effect, but ammonia lowered the strength of the cylinders. All the strength measurements were carried out at −10° C.

Reactive convective-dissolution in a porous medium: stability and nonlinear dynamics

2018 ◽  
Vol 20 (33) ◽  
pp. 21617-21628
Author(s):  
Parama Ghoshal ◽  
Silvana S. S. Cardoso
Keyword(s):  
Nonlinear Dynamics ◽  
Boundary Layer ◽  
Porous Medium ◽  
Nonlinear Dynamic ◽  
Dynamic Behaviour ◽  
Diffusive Boundary Layer ◽  
Onset Of Convection ◽  
Dissolution Reaction ◽  
Diffusive Boundary ◽  
Medium Stability

We show that, unexpectedly, a dissolution reaction, A(aq) + B(s) → C(aq), with the density contribution of the product C smaller than that of the dissolved solute A, can destabilize a diffusive boundary layer accelerating the onset of convection and can substantially alter the nonlinear dynamic behaviour.

scholarly journals Compressive Strength Properties of Snow

1959 ◽  
Vol 3 (25) ◽  
pp. 345-354 ◽  
Author(s):  
H. H. G. Jellinek
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Compressive Strength ◽  
Chemical Reaction ◽  
Strength Properties ◽  
Measurable Effect ◽  
First Order ◽  
Order Chemical Reaction ◽  
Snow Particle ◽  
First Order Chemical Reaction

Abstract The compressive strength of snow cylinders was investigated as a function of the age of the snow from which the cylinders were made, the snow particle size and the age of the cylinders. The results show that the compressive strength is reduced if the snow is older, if the particle size is smaller, or if the cylinders are younger. The variation with age of the cylinders can be represented by an equation similar to that for a first-order chemical reaction. The effect of adding small quantities of various gases to the atmosphere in which the cylinders were kept was also investigated; carbon dioxide and methane had no measurable effect, but ammonia lowered the strength of the cylinders. All the strength measurements were carried out at −10° C.

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