Interfacial Dynamics of Miscible Displacement of Shear-Thinning Fluid in a Vertical Channel
نویسندگان
چکیده
The displacement of a shear-thinning fluid by denser and less viscous Newtonian in vertical duct is investigated using experiments numerical simulations. We study how increased viscosity contrast between the fluids affect displacement. Our results show that degree significantly influences development interfacial patterns growth perturbations. In weakly regime, progresses as stable with no visible instabilities. Increasing displaced result Saffman–Taylor type instability several finger-shaped channels carved across width duct. strongly unique finger an uneven interface formed middle fluid. This eventually breaks through at outlet, leaving behind considerably stagnant wall layers side walls. link onset fingering to fluids, stabilizing density difference, expressed modified, unperturbed pressure gradient for two fluids. Numerical simulations are performed both initial flat interface, perturbed we find good qualitative agreement experimental observations computations.
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ژورنال
عنوان ژورنال: Fluids
سال: 2023
ISSN: ['2311-5521']
DOI: https://doi.org/10.3390/fluids8020035