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We investigate the miscible displacement of a viscous liquid by a lessviscous one in a porous medium, which frequently leads to the formation of amixing zone characterized by thin fingers. The mixing zone grows in time due tothe difference in speed between the leading and trailing edges. The transverseflow equilibrium (TFE) model provides estimates of these speeds. We propose anenhancement for the TFE estimates. It is based on the assumption that anintermediate concentration exists near the tip of the finger, which allows toreduce the integration interval in the speed estimate. Numerical simulations ofthe computational fluid dynamics model were conducted to validate the newestimates. The refined estimates offer greater accuracy than those provided bythe original TFE model.

Relation between size of mixing zone and intermediate concentration in miscible displacement