毛細管中の超流動ヘリウムの熱伝達

概要

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We have measured the heat transfer in superfluid helium in a glass capillary tube. Heat supplied to the one end of the tube produces a thermal counterflow in the tube. The temperature difference (ΔT) across the tube was measured using a thermocouple (Au(0.03%Fe)-Nb Ii) and a SQUID detector. The obtained values of the vortex line density coefficint (γ) in the fully developed turbulent region (the second turbulent region) agree with the values calculated by Schwarz and also other authors. We observed a large peak of the relaxation time of the temperature difference at the first turbulent-second turbulent transition. This peak clearly distinguish the second turbulent from the first turbulent. The fluctuations of the temperature difference was observed at the turbulent-laminar transition. From the amplitude of the fluctuation we could determined the minimum vortex line density (critical line density) in a turbulent superfluid. Its temperature dependence is considered to be influenced by the normalfluid velosity.
岡山理科大学の論文
1989-03-20