超流動ヘリウム中の量子渦による圧力損失

概要

論文の詳細を見る
Measurements have been made of the heat transfer in liquid helium II in two capillary glass tubes. The inside diameter of the glass tube were 130μm and 126μm respectively, their length were 9.6 cm both. Heat supplied to a lower part of a cell produced a thermal counter flow in the glass tube. The temperature differences (ΔT) across the tube was measured using a thermocouple (Au [0.03 at. % Fe]-Nb・Ti) with a SQUID detector. The pressure difference (ΔP) across the tube was detected by two phosphor-bronze-membrane pressure transducers. The quantuized vortex line length density calculated from the temperature differences showed the two regions, the turbulent I and II. In the turbulent II, Donnelley's scaling coefficient was obtained from the gradient of the reduced vortex line length density vs. the relative velocity. This was fit for the calculation value by K. W. Schwarz. The interaction coefficient between the vortex line and the tube wall was investigated using scaling method from the pressure difference data. The obtained value of the interaction coefficient in the turbulent I region was the same value as that of the turbulent II region.
岡山理科大学の論文