Onset of dissolution-driven instabilities in fluids with nonmonotonic density profile.

Analog systems have recently been used in several experiments in the context of convective mixing of CO(2). We generalize the nonmonotonic density dependence of the growth of instabilities and provide a scaling relation for the onset of instability. The results of linear stability analysis and direct numerical simulations show that these fluids do not resemble the dynamics of CO(2)-water convective instabilities. A typical analog system, such as water-propylene glycol, is found to be less unstable than CO(2)-water. These results provide a basis for further research and proper selection of analog systems and are essential to the interpretation of experiments.