We report on observations of the onset of dissipation in superfluid 3He flowing through a single cylindrical channel of diameter d = 0.7 µm and length L = 6.0 µm. We propose a model in which thermally activated phase slips in the order parameter can account for the observed onset of dissipation.
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Pekola, J.P., Davis, J.C. & Packard, R.E. Evidence for thermally activated dissipation in flowing superfluid 3He. J Low Temp Phys 71, 141–149 (1988). https://doi.org/10.1007/BF00115046
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DOI: https://doi.org/10.1007/BF00115046