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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Sphere on a vibrating reed for measurements of turbulence in superfluid helium
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Sphere on a vibrating reed for measurements of turbulence in superfluid helium

机译：振动簧片上的球体，用于测量超流氦中的湍流

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摘要

A modification of the vibrating reed, in which a massive sphere is made to oscillate at the end of a cantilevered beam, has been used for measurements in superfluid helium. The apparatus operates in the same way as a conventional vibrating reed with capacitive detection and drive. However, when operating submerged in the liquid, the frequency changes give information on the superfluid fraction, and the dissipation can be used to obtain information on the change of liquid flow, from laminar to turbulent. The spherical geometry allows an exact calculation of all parameters in the laminar regime, so departures due to the turbulence can be better quantified. The method has been found to work well in practice, and some measurements on the turbulent regime in the superfluid are presented.
机译：振动簧片的一种改型已用于在超流体氦气中进行测量，其中在悬臂梁的末端使一个大的球体振动。该设备的操作方式与带有电容检测和驱动功能的传统振动片相同。但是，当浸没在液体中时，频率变化会提供有关超流体分数的信息，而耗散可用于获取有关从层流到湍流的液体流量变化的信息。球形几何形状可以精确计算层流状态中的所有参数，因此可以更好地量化湍流引起的偏差。已经发现该方法在实践中行之有效，并且提出了对超流体中湍流状态的一些测量。

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