Abstract
The normal fluid density ρ n and the specific heatc v are calculated for helium II flowing through plane parallel slits and capillaries with a square profile at temperatures below1 K. Both functions increase over their bulk values if the thermal phonon wavelength λ becomes comparable to or larger than the smallest dimensiond of the container. The asymptotic expansions which are obtained in this paper have an overlapping range of validity, and therefore describe ρ n andc v rather accurately for all values of λ/d.
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References
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Haug, H. On size effects in helium II below 1 K. J Low Temp Phys 12, 479–490 (1973). https://doi.org/10.1007/BF00654951
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DOI: https://doi.org/10.1007/BF00654951