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- W2058200260 abstract "We study the displacement of miscible fluids between two parallel plates, for different values of the Péclet number Pe and of the viscosity ratio M . The full Navier–Stokes problem is addressed. As an alternative to the conventional finite difference methods, we use the BGK lattice gas method, which is well suited to miscible fluids and allows us to incorporate molecular diffusion at the microscopic scale of the lattice. This numerical experiment leads to a symmetric concentration profile about the middle of the gap between the plates; its shape is determined as a function of the Péclet number and the viscosity ratio. At Pe of the order of 1, mixing involves diffusion and advection in the flow direction. At large Pe , the fluids do not mix and an interface between them can be defined. Moreover, above M ∼10, the interface becomes a well-defined finger, the reduced width of which tends to λ ∞ =0.56 at large values of M . Assuming that miscible fluids at high Pe are similar to immiscible fluids at high capillary numbers, we find the analytical shape of that finger, using an extrapolation of the Reinelt–Saffman calculations for a Stokes immiscible flow. Surprisingly, the result is that our finger can be deduced from the famous Saffman–Taylor one, obtained in a potential flow, by a stretching in the flow direction by a factor of 2.12." @default.
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- W2058200260 date "1997-05-10" @default.
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- W2058200260 title "Miscible displacement between two parallel plates: BGK lattice gas simulations" @default.
- W2058200260 doi "https://doi.org/10.1017/s0022112097004928" @default.
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