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Observations of quantized vorticity generated in superfluid 4He flow through 2-Μm-diameter orifices

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A beam of charged vortex rings is used to study the vorticity present downstream from an array of 2-Μm-diameter orifices through which a steady flow of superfluid 4He is driven at known velocity and pressure head δp. From the measured attentuation of the beam at low δp, we infer a density of vortex line less than predicted by the Feynman critical velocity model. Possible explanations are considered. We find evidence that an interconnected tangle of vortices is formed above a certain value of δp, which is in reasonable agreement with theory, at least for one orifice plate. Charge transfer and transient attenuation measurements indicate that this tangle decays in part into small vortex rings. These results are compared with an earlier experiment of Gamota.

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Authors and Affiliations

  1. Department of Physics, University of Virginia, Charlottesville, Virginia

    B. M. Guenin & G. B. Hess

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  1. B. M. Guenin
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  2. G. B. Hess
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Research supported in part by the National Science Foundation under grant DMR 72-02971.

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Guenin, B.M., Hess, G.B. Observations of quantized vorticity generated in superfluid 4He flow through 2-Μm-diameter orifices. J Low Temp Phys 33, 243–254 (1978). https://doi.org/10.1007/BF00114997

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  • DOI: https://doi.org/10.1007/BF00114997

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