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Flow and reaction of carbon dioxide stored in saline aquifers

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We study the stability of a buoyant diffusive boundary layer in a porous medium in the presence of a first-order chemical reaction and show that it is fully determined by the non-dimensional number Da/Ra2 , where Da is the Damkholer number and Ra is the solutal Rayleigh number. The time for onset of convection is shown to increase with rising . Above a critical , no convection occurs as reaction stabilizes the diffusive layer at a finite thickness. This thickness decreases with increasing, becoming negligible at. The results are applied to CO2 geostorage, suggesting distinct regimes of CO2 transport in saline aquifers.

This talk is part of the BPI Seminar Series series.

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