Abstract
The differential pressure across channels has been measured as a function of the flow rate of superfluid helium for two different systems of long narrow channels in the temperature range 1.3–2.2 K. The systems were a wire-filled capillary with a 10-µm gap and a rod of porous Vycor glass with an average pore diameter of ∼60 Å. A large hysteresis is observed for Vycor, while for the capillary, in the limit of high temperatures and large velocities, the flow characteristics tend to those of a normal fluid with the same viscosity.
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Talmi, A., Landau, J. Isothermal flow of superfluid helium through narrow channels. J Low Temp Phys 12, 275–283 (1973). https://doi.org/10.1007/BF00654865
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DOI: https://doi.org/10.1007/BF00654865