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• W2110958090 abstract "The steady two-dimensional seepage flow by gravitational convection, of a fluid of density ρ 1 surrounded by a fluid of density ρ 0 (≠ρ 1 ) at rest, leads to a potential problem from which the shape of the interface can be determined. When the two fluids are slightly miscible the interface is replaced by a mixing layer, and it is shown that the first-order Prandtl equations for the flow in the layer possess an exact similarity solution. The profile across the layer is of the same form as the profile of the laminar incompressible half-jet with one fluid at rest, and a formula is obtained for the scale of mixing-layer thickness as a function of distance downstream. Three examples are discussed. ( a ) Flow of fluid of density ρ 1 from a horizontal line source. When (ρ 1 > ρ 0 ) a stagnation point exists above the source, and the fluid ultimately descends in a vertical column of width proportional to the source strength. At the stagnation point, the mixing-layer thickness is finite and is proportional to the square root of the radius of curvature of the interface. At a sufficiently great distance downstream, the thickness increases as the square root of the distance, as in the straight laminar half-jet. These results have been tested experimentally in a Hele-Shaw cell. ( b ) Symmetrical flow of an ascending column of fluid (ρ 1 < ρ 0 ) about an obstacle in the form of a finite horizontal strip. The column reforms after passing the obstacle, and the mixing-layer thickness returns to the value corresponding to an unobstructed vertical half-jet. The flow has been produced experimentally. ( c ) Flow in a lens of fresh water overlying salt water, with inflow due to precipitation, as in a two-dimensional Ghyben-Herzberg lens. Here the potential flow solution is calculated approximately by means of Dupuit-Forchheimer theory. In the steady-state solution the thickness of the mixing layer between fresh and saline water is found to be finite and, as in ( a ), proportional to the square root of the radius of curvature of the lens." @default.
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• W2110958090 date "1964-05-01" @default.
• W2110958090 modified "2023-09-27" @default.
• W2110958090 title "Mixing-layer flows in a saturated porous medium" @default.
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• W2110958090 doi "https://doi.org/10.1017/s0022112064000568" @default.
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