A pH sensitive dye technique has been used to highlight the zones of greatest scalar concentration in a turbulent jet as color regions. Photographs taken with a motion picture camera showed circular zones of the width of the jet moving downstream. These expand downstream and lose color until they are only small patches and wisps of red. A scheme has been developed whereby the Lagrangian velocity of the most concentrated zones can be measured. These move regularly at constant or steadily decreasing speed along rays originating in the source. The speed is about twice that of the mean Eulerian velocity component.
Experiments in Fluids – Springer Journals
Published: Jul 28, 1997
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