ATTENUATION OF SECOND SOUND IN HELIUM II BETWEEN ROTATING CYLINDERS.
ATTENUATION OF SECOND SOUND IN HELIUM II BETWEEN ROTATING CYLINDERS.
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旋转圆筒之间氦 II 中第二声音的衰减。
DOI：
10.1103/physrev.153.280
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
P. J. Bendt
中科院分区：
文献类型：
--
作者：
P. J. Bendt
In an annular resonant cavity, we have shown that the attenuation of second sound is the same for solid-body rotation, rotation of the outside cylinder only, and rotation of the inside cylinder only, if plotted against $|\mathrm{curl} {\mathbf{v}}_{s}|$, where the superfluid velocity ${\mathbf{v}}_{s}$ is calculated by classical hydrodynamics. Additional attenuation due to secondary flow was observed when the inside cylinder only rotated faster than 0.4 rad/sec. In solid-body rotation, we find that the attenuation plotted as a function of angular velocity deviates from linearity by not more than 1%, out to 6 rad/sec. We measured the perpendicular mutual-friction coefficient $B$ at 50-mdeg intervals between 1.2 and 2.08\ifmmode^\circ\else\textdegree\fi{}K, with an uncertainty of \ifmmode\pm\else\textpm\fi{} 2% in the smoothed values; our values of $B$ are 4 to 8% higher than previous measurements by Hall and Vinen. We also measured the velocity of second sound to \ifmmode\pm\else\textpm\fi{}1%.
In an annular resonant cavity, we have shown that the attenuation of second sound is the same for solid-body rotation, rotation of the outside cylinder only, and rotation of the inside cylinder only, if plotted against $|\mathrm{curl} {\mathbf{v}}_{s}|$, where the superfluid velocity ${\mathbf{v}}_{s}$ is calculated by classical hydrodynamics. Additional attenuation due to secondary flow was observed when the inside cylinder only rotated faster than 0.4 rad/sec. In solid-body rotation, we find that the attenuation plotted as a function of angular velocity deviates from linearity by not more than 1%, out to 6 rad/sec. We measured the perpendicular mutual-friction coefficient $B$ at 50-mdeg intervals between 1.2 and 2.08\ifmmode^\circ\else\textdegree\fi{}K, with an uncertainty of \ifmmode\pm\else\textpm\fi{} 2% in the smoothed values; our values of $B$ are 4 to 8% higher than previous measurements by Hall and Vinen. We also measured the velocity of second sound to \ifmmode\pm\else\textpm\fi{}1%.