Abstract
Convective dissolution, relevant to CO${}_{2}$ geological sequestration, occurs when a given species dissolves in a host phase and increases density. Chemical reactions have been shown to enhance this convection. If the chemical species involved diffuse at different rates, an additional convection zone due to double-diffusion processes can develop below the reaction front in addition to the dissolution-driven Rayleigh-Taylor instability below the interface. An analysis of the influence of the interaction between these various convective modes on the nonlinear dynamics and on the dissolution flux is presented.
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