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Vortex Shedding from the End of a Tube as a Result of Buoyancy Effects

Naturevolume 192page1277 (1961) | Download Citation



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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  1. 1

    Magarvey, R. H., and Bishop, Roy L., The Physics of Fluids, 4, 800 (1961).

  2. 2

    Tritton, D. J., J. Fluid Mechanics, 6, 547 (1959).

  3. 3

    Sato, Hiroshi, J. Fluid Mechanics, 7, 53 (1960).

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  1. Mechanical Engineering Department, Battelle Memorial Institute, Columbus, 1, Ohio

    • A. A. PUTNAM


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