Abstract
ONE of the most interesting phenomena observed in fluid flow is that of vortex shedding, the best known example of which is the von Kármán vortex street behind a cylinder or similar obstacles normal to the flowing stream. For such two-dimensional systems, there is considerable information available. However, for axially symmetric systems, there appears to be little more than the recent results of Magarvey and Bishop1 on spheres. Therefore, a study of vortex shedding in axially symmetric systems was initiated under Battelle sponsorship. In one system, vortices as shown in Fig. 1 were observed in alkaline water (containing amounts of sodium carbonate neutralized by up to 1.24 c.c. nitric acid/litre) discharging from a long vertical tube into a large plenum chamber. The chamber contained slightly acidic water (up to 7.65 c.c. nitric acid/litre). Reynolds numbers down to the experimental limit of above 200 were investigated. The flow pattern was revealed by phenolphthalein added to the inlet water supply.
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References
Magarvey, R. H., and Bishop, Roy L., The Physics of Fluids, 4, 800 (1961).
Tritton, D. J., J. Fluid Mechanics, 6, 547 (1959).
Sato, Hiroshi, J. Fluid Mechanics, 7, 53 (1960).
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PUTNAM, A. Vortex Shedding from the End of a Tube as a Result of Buoyancy Effects. Nature 192, 1277 (1961). https://doi.org/10.1038/1921277a0
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DOI: https://doi.org/10.1038/1921277a0
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