Basic Study of Visualization for New Multiple Flows of Jet Streams from Diamond-Shaped Cylinder Bundles

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The flow visualization work with the aid of PIV and Piezometer deals with flip-flop flow around diamond-shaped cylinder bundle revised with concavities on both bundle walls. It is disclosed that (i) the concavity constructed on both side-walls of a diamond cylinder induces a substantial change in the flow patterns in the exit jet-stream field and jet-stream dispersion, (ii) pressure characteristics are quantitatively measured in a diverging-flow region in the diamond cylinder and the cavity with bundles, and in its downstream region, and (iii) flip-flop flow occurs in the flow passages and its occurrence condition is obtained.