Stabilization of periodically forced Hele-Shaw flows by means of a nonmonotonic viscosity profile.
basic_science · Level V
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- Record sourced from PubMed, PMID 35854486.
- Also identified by DOI 10.1103/PhysRevE.105.065104.
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Abstract
The onset of viscous fingering in the presence of a viscosity profile is investigated theoretically for two immiscible fluids undergoing a time-dependent injection. Here, we show that the presence of a positive viscosity gradient at the interface between both fluids stabilizes the interface facilitating the spread of the perturbation. This effect is much more pronounced in the case of sinusoidal injection flows. The influence of the viscosity gradient on the dispersion relation is analyzed. Numerical simulations of the Navier-Stokes equation confirm the linear stability analysis.