A342 電解駆動 2 次流れに対する地形効果

概要

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A flow visualization study has been made of the effects of a bottom topography on a quasi-2D steady streaming induced by a localized, oscillatory, primary flow of an aqueous electrolyte solution in a shallow water tank. The oscillatory flow is driven by the Lorentz force due to the interaction between a localized static magnetic field and an electrolytic current passing through the fluid. The tracer particle method is used for surface-flow visualization. It is found that the basic flow pattern is an induced steady streaming consisting of four counter-rotating vortices. When a V-shaped-cross-sectional straight trough or a rectangular-cross-sectional straight trough is made in the floor of the tank with its axis in the cross-flow direction. the steady streaming is constrained to flow along the rims of the trough. Furthermore, when background rotation is involved, two cyclonic vortices among the four are likely to be persistent while the other two anti-cyclonic ones vanish.
2000-07-25