Opposite effects of a reaction-driven viscosity decrease on miscible viscous fingering depending on the injection flow rate.

The article explores how a reaction-driven decrease in viscosity affects viscous fingering patterns at different injection flow rates. Research shows that at high flow rates, the reaction leads to thinner fingers covering a smaller area due to enhanced shielding effects, while at low flow rates, the reaction stabilizes the displacement, resulting in almost stable patterns. The study emphasizes the role of diffusivity in determining the impact of reactions on viscous fingering patterns, particularly in relation to varying Péclet numbers. [Extracted from the article]