Quantum mechanics

Mixing (physics)

Engineering

Chemical physics

Permeability (electromagnetism)

Materials science

Biochemistry

Chemical engineering

Mass transfer

Geology

Porosity

Dissolution

Physical chemistry

Fluid dynamics

Thermodynamics

Boundary layer

Physics

Homogeneous

Instability

Membrane

Convective mixing

Porous medium

Composite material

Chemistry

Mechanics

Viscous fingering

Convection

Water Resources Research

Density‐driven convection mixing has been identified to enhance CO 2 trapping in deep saline aquifers storage. In this study, the dynamics of fingering instability and associated mass transfer caused by convection mixing between the movements of miscible analogue fluid pairs are investigated by magnetic resonance imaging (MRI). Two kinds of homogeneous porous media and six kinds of heterogeneous porous media with varying permeability permutations were used at ambient pressure and temperature. In homogeneous porous media, the detail analyses on the data of fingering pattern, finger number and distribution identify that the large finger sizes and high sinking velocities can be developed when the permeability up to 3.3 × 10 −11 m 2 . In heterogeneous porous media, the sand layer first touched by downward fingers plays a dominant role in finger evolution, channeling and fingering convection mechanisms were found among these cases. Moreover, the dissolution rate characterized by Sherwood number (Sh m ) (enhance or inhibit fluid mixing, depending on the layout of the sand layer) was found to be independent of the local convection dissolution, such as vortex flow and finger splitting at the sand boundary with mutation permeability (enhanced fluid mixing, promoting CO 2 dissolution in carbon storage). Finally, the total CO 2 dissolution rate Sh m in all cases was compared, Sh m are at a range of 970–5,079 in homogeneous porous media, while are 190–688 in heterogeneous porous media.

Unstable Density‐Driven Convection of CO <sub>2</sub> in Homogeneous and Heterogeneous Porous Media With Implications for Deep Saline Aquifers

Unstable Density‐Driven Convection of CO 2 in Homogeneous and Heterogeneous Porous Media With Implications for Deep Saline Aquifers

Unstable Density‐Driven Convection of CO ₂ in Homogeneous and Heterogeneous Porous Media With Implications for Deep Saline Aquifers