Abstract
We report an experiment in which superfluid flow through a single 10-µm diameter orifice is examined at pressure heads as low as 0.03 dyne/cm2. Accurate measurements of low pressure head are made possible by a recirculating flow cryostat, capable of generating a calibrated, continuous flow of superfluid helium. Current vs. potential data for temperatures between 1.46 and 2.14 K are analyzed according to the Iordanskii-Langer-Fisher thermal nucleation theory, modified to apply to a model in which vortex half-rings are inhomogeneously nucleated at the sharp-edged mouth of the orifice. We offer two possible interpretations of the results.
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Parts of this work were carried out with the support of National Science Foundation grants DMR-72-02971 and DMR-78-10778.
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Brown, Y.J., Hess, G.B. Inhomogeneous nucleation of superfluid vorticity at a sharp edge. J Low Temp Phys 49, 267–277 (1982). https://doi.org/10.1007/BF00681592
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DOI: https://doi.org/10.1007/BF00681592