Viscous fingering (VF) is a phenomenon in which the interface between two fluids
of having viscosities is fluid-dynamically unstable in porous media, with finger-like patterns
forming as the less viscous fluid displacing the more viscous one. In this article, studies
investigating the fundamental characteristics of the coupling between chemistry and hydrodynamics
in reactive VF are reviewed. For this purpose, reactive VF has been divided
into two types depending on whether or not the reaction changes the VF dynamics i.e., the
active or passive cases of reactive VF, respectively. In this review, I first consider the passive
and active cases, and then further discuss a third type of reactive VF as well. This third type of reactive is
VF fully triggered by a chemical reaction in which VF does not take place in the absence of the chemical reaction.
Finally, potential future topics of research are discussed.
Keywords: Chemical reactions, finger-like patterns, Hele-Shaw (HS) cell, Péclet number, radial HS cell,
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