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- W2084234156 abstract "The thermal conductivity of liquid He II in the interstices of a column of packed jeweler's rouge (Fe2O3 powder) has been found to have a temperature dependence: k ∝ Tn, where n falls monotonically from a value of 13 at 1.5°K to possibly zero at the lambda point. The value of the thermal conductivity at the lambda point is 0.60 ± 0.03 w/cm°K. From the flow of helium, nitrogen, and water at room temperature it is estimated that a typical rouge column provides the equivalent of about 1.4 × 109 parallel channels having an average diameter of 0.18 ± 0.02μ. The viscosity of the normal component of He II, computed from the measured conductivity on the basis of the two-fluid model, follows a temperature dependence very similar to that observed for the bulk liquid and for 52-and 108-μ capillaries above 1.9°K. The magnitude of the values, however, is lower, but in agreement with that obtained in Leiden with 0.7-μ slits. Empirical values of a correcting slip coefficient are smaller in magnitude (0.007μ) and less temperature dependent (−0.018μ/°K) than theoretical values calculated at Oxford. It was not possible, though, to rule out a phonon mean free path effect of the order of magnitude calculated by Atkins. Points on the lambda line have been determined from the fountain effect for pressures below 0.4 atm. The slope of the line is approximately −70 atm/°K, in agreement with the slope determined at higher pressures by other means." @default.
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- W2084234156 date "1960-09-01" @default.
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- W2084234156 title "Transport Properties of Helium II in Fine Channels" @default.
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- W2084234156 doi "https://doi.org/10.1063/1.1706119" @default.
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