Abstract
A laser induced fluorescent dye technique was used to visualize the steady-state flow driven by a rotating bottom in an open, cylindrical container. The flow behaviour and the vortex breakdown conditions were studied as a function of the container aspect ratio H/R and the Reynolds number Re = ΩR2/v. Like in the closed container configuration, previously studied by Vogel (1968) and Escudier (1984), vortex breakdown occurs in a certain parameter range (H/R, Re). However, in the free surface configuration vortex breakdown conditions as well as the forms of the breakdown bubbles differ notably from what is observed in the closed container configuration. In particular, it is found that as Re is increased, the breakdown bubbles get attached to the free surface and grow in diameter.
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