Abstract
The viscous fingering or Saffman-Taylor instability occurs when a less viscous fluid penetrates a more viscous fluid in a porous medium. Fingering patterns refer to the deformation of the interface between the invading and displaced fluids. For mixtures composed of three miscible species, the dynamic of each component varies greatly. In that case, multicomponent diffusion effects are of primary importance, and reverse diffusion could trigger the instability from a configuration that is known to be stable for binary mixtures.
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