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Influence of the Péclet number on reactive viscous fingering

par Shukla, Priyanka;De Wit, Anne
Référence Physical Review Fluids, 5, 1, 014004
Publication Publié, 2020-01-01

Article révisé par les pairs

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Résumé :

The hydrodynamic viscous fingering instability can be influenced by a simple viscosity-changing chemical reaction of type A+B→C, when a solution of reactant A is injected into a solution of B and a product C of different viscosity is formed by reaction. We investigate here numerically such reactive viscous fingering in the case of a reaction decreasing the viscosity to define the optimal conditions on the chemical and hydrodynamic parameters for controlling fingering. In particular, we analyze the influence of the Péclet number, Pe, on the efficiency of the chemical control of fingering. We show that the viscosity-decreasing reaction has an increased stabilizing effect when Pe is decreased. On the contrary, fingering is more intense and the system more unstable when Pe is increased. The related reactive fingering patterns cover then respectively a smaller (larger) area than in the nonreactive equivalent. Depending on the value of the Péclet number, a given chemical reaction may thus either enhance or suppress a fingering instability. This stabilization and destabilization at low and high Pe are shown to be related to the Pe-dependent characteristics of a minimum in the viscosity profile that develops around the miscible interface thanks to the effect of the chemical reaction.