Abstract
The present study investigates the effects of impurities on convective mixing processes in geological sequestration of CO${}_{2}$ at pore scale. We focus on the concentration expansion coefficient and diffusion rate of different impurities, the effects of which on the fingering phenomena, dissolution flux, as well as the onset time of convection ${t}_{o\phantom{\rule{0}{0ex}}n}$ are mainly analyzed. Based on the numerical results, the mathematical form of effective Rayleigh number Ra${}_{e}$ in a multicomponent system is fit, which could ensure that the scaling relations between ${t}_{o\phantom{\rule{0}{0ex}}n}$ and Ra${}_{e}$ are consistent with that in a pure system.
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