Speaker
Description
We analyze the impact of permeability heterogeneity on reactive buoyancy-driven convective dissolution in the case of a bi-molecular $\mathrm{A} + \mathrm{B} \to \mathrm{C}$, which leads to different non-monotonic density profiles. We compare the reaction and mixing dynamics between homogeneous permeability fields and heterogeneous scenarios consisting of horizontally stratified, vertically stratified, and log-normally distributed permeability fields. We show how the total amount of reaction product, mixing length, front position and width, reaction and scalar dissipation rates, and dissolution fluxes, are strongly influenced by the type of permeability heterogeneity. Vertically stratified and log-normally distributed permeability fields lead to larger values for all observables compared to homogeneous fields. Horizontally stratified fields act as an obstacle to convective flow, resulting in slower front progression, thicker fingers, wider reaction fronts, and the lowest dissolution fluxes among all cases. In log-normally distributed fields, the flow behavior depends on the anisotropy ratio. Overall, a shorter horizontal correlation length relative to the vertical one leads to an increase in the value of all aforementioned observables and thus to a more efficient mixing. These findings reveal how heterogeneity affects convective dynamics by influencing the reaction front, dissolution rates, mixing behavior, and mass transport efficiency, emphasizing the intricate role of permeability structure in reactive convective processes.
| Country | Spain |
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