Initial studies of a linear motor for generating quantum turbulence in He-II with a drawn grid

Initial studies of a linear motor for generating quantum turbulence in He-II with a drawn grid
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用于在 He-II 中产生量子湍流的直线电机绘制网格的初步研究

DOI:
10.1088/1742-6596/150/1/012014
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发表时间:
2009
期刊:
Conference Series
影响因子:
--
通讯作者:
Giltrow M
Giltrow M
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--
文献类型:
--
作者:
Giltrow M

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量子湍流(QT)的研究需要一种方法来产生特征良好的QT。对于包含可忽略的正常流体密度的系统,这必须在不同时引入由于例如机械部件之间的摩擦引起的外部加热的情况下实现。依赖于振荡物体的方法产生可忽略不计的外部加热,但具有空间和时间不均匀速度的缺点。此外,振动网格通过它自己创建的QT来回移动。因此,特征长度尺度具有不确定性。因此,我们正在开发一个一维线性电机绘制一个稳定的网格,一旦,通过He-II在mK的温度。与其他设计相比,无磁轴承用于悬浮移动元件,排除机械耗散。详细的设计和初步测试,并定量比较理论和实际的低温性能,将介绍和讨论。
Studies of quantum turbulence (QT) require a means of generating well-characterised QT. For systems containing negligible normal fluid density this must be achieved without simultaneously introducing extraneous heating due, for example, to friction between mechanical components. Methods relying on oscillating objects produce negligible extraneous heating, but suffer from the disadvantages of both spatially and temporally nonuniform velocity. In addition, the vibrating grid goes back and forth through the QT it has itself created. Hence the characteristic length scale is subject to uncertainty. We are therefore developing a one-dimensional linear motor to draw a grid steadily, once, through He-II at mK temperatures. Frictionless magnetic bearings are used to levitate the moving elements in contrast to other designs, precluding mechanical dissipation. Details of the design and of the initial tests, and a quantitative comparison of theoretical and actual cryogenic performance, will be presented and discussed.
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