Observation of second sound attenuation across a superfluid suction vortex
Observation of second sound attenuation across a superfluid suction vortex
复制标题
超流体吸力涡流中二次声衰减的观察
DOI：
10.1007/s10909-019-02164-z
复制
发表时间：
2019
影响因子：
2
通讯作者：
Itsuki Matsumura; Katsuyoshi Ohyama ; Koji Sato; Ken Obara ; Hideo Yano; Osamu Ishikawa
中科院分区：
文献类型：
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作者：
細谷知輝;伊藤孝寛;仲武昌史;出田真一郎;田中清尚;播磨尚朝;辺土正人;仲間隆男;大貫惇睦;Itsuki Matsumura; Katsuyoshi Ohyama ; Koji Sato; Ken Obara ; Hideo Yano; Osamu Ishikawa
最近，作者成功地产生了超流抽吸涡流，这是一种由低温离心泵直接驱动的空心巨型涡流。本研究和相关工作的最终目标是确定量子涡线的局部密度的分布作为旋转速度和抽吸流的大小的函数。虽然超流氦在旋转叶片中的流动（其中涡线排列成三角形网格）被认为是刚体运动，但吸入涡的涡线分布仍然是一个悬而未决的问题。在这项研究中，第二声穿过吸入涡流的衰减进行了测量。结果发现，第二种声音的阻尼因子随转速的增加而增加;然而，发现表观涡线密度与转速不成比例，尽管之前已经证明总循环与转速成比例。本文讨论了吸力涡周围量子涡线的一种可能图象。
Recently, the authors succeeded in generating a superfluid suction vortex, which is a giant vortex with a hollow core, driven directly by a cryogenic centrifugal pump. The ultimate goal of this study and related work is to determine the distribution of the local density of the quantum vortex lines as a function of the rotational speed and the magnitude of the suction flow. Although the flow of superfluid helium in a rotating bucket, in which the vortex lines are arranged to form a triangular lattice, is known to show rigid body motion, the vortex line distribution of the suction vortex remains an open question. In this study, the attenuation of the second sound across the suction vortex was measured. As a result, it was found that the damping factors of the second sound increased with increasing rotational speed; however, it was found that the apparent vortex line density is not proportional to the rotational speed despite the fact that the total circulation has been previously shown to be proportional to the rotational speed. A possible picture of the quantum vortex lines around the suction vortex is discussed in this paper.