Effect of permeability heterogeneity on reactive convective dissolution

We investigate the impact of permeability heterogeneity on a bimolecular A + B \ensuremath{\rightarrow} C reaction that creates a nonmonotonic fluid density profile which can trigger or suppress convective instabilities. The intensity and structure of heterogeneity control how mixing and reaction scale. We find opposing trends for the mixing of reactants and the reaction depending on the media stratification and the density profile. In horizontally stratified media, reaction is hindered by heterogeneity, while in vertically stratified ones it favors reaction. A similar reaction-favoring behavior is also observed for anisotropic multi-Gaussian log-permeability fields.