Abstract
Dye filament techniques were employed to investigate streamline configurations for both converging and diverging radial flow. Inherent characteristic of diverging flow are the boundary layer separation phenomena and the formation of axially symmetric vortex sheets. The onset of boundary layer separation is predicted from a dimensionsless stability parameter which is derived from a semi-empirical expression found to be in approximate agreement with wall pressure data. For flows significancyly in excess of the critical rate, disturbance oscillations were observed to amplify and generate eddies. At very high rates of diverging flow, both steady state and transient cavitation were observed. These phenomena are closely linked with the vortex formations. In contrast, converging flow retained a laminar character up to the highest rate of flow attainable.
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