The causes of a discrepancy in the results of measurements of He II viscosity below T ∩ 1.6 k obtained with different measurement methods are investigated. It is shown that to obtain correct results in oscillation experiments, the condition δ ≫ λph should obtain, where δ is the depth of viscous wave penetration and λph is the phonon free path length. Results of viscosity measurements at different ratios δ/λph (by a wire viscometer) are presented. It is shown that for the condition δ ≫ λph, the results obtained are in good agreement with the results of Andronikashvili (in which δ/λph > 100). If the mentioned relation is not satisfied, then, as the value of the ratio δ/λph is decreased, the value measured for the viscosity is increasingly lower than the results of Andronikashvili.
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Nadirashvili, Z.S., Tsakadze, J.S. Dependence of helium II viscosity properties on oscillation frequency. J Low Temp Phys 37, 169–177 (1979). https://doi.org/10.1007/BF00114065
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DOI: https://doi.org/10.1007/BF00114065