摘要翻译:
在超流体3He-B的外加流动中,当温度为0.6Tc时,由于涡旋运动中的阻尼随温度的降低而迅速减小,量子化涡旋的稳定性发生了深刻的变化。在低阻尼时,一个演化的涡旋可能变得不稳定,并产生一个新的独立涡旋环。这种单涡不稳定性是湍流的一般前兆。在中温区(0.3-0.6)Tc,我们用非侵入式NMR测量了旋转圆柱样品的不稳定性。通过与数值计算的比较,我们解释了当涡流端沿壁面移动时,不稳定性发生在容器壁面。
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英文标题:
《The dynamics of vortex generation in superfluid 3He-B》
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作者:
R. de Graaf, R. Hanninen, T.V. Chagovets, V.B. Eltsov, M. Krusius, and
R.E. Solntsev,
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最新提交年份:
2008
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分类信息:
一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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一级分类:Physics 物理学
二级分类:Superconductivity 超导电性
分类描述:Superconductivity: theory, models, experiment. Superflow in helium
超导:理论,模型,实验。氦中超流
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英文摘要:
A profound change occurs in the stability of quantized vortices in externally applied flow of superfluid 3He-B at temperatures ~ 0.6 Tc, owing to the rapidly decreasing damping in vortex motion with decreasing temperature. At low damping an evolving vortex may become unstable and generate a new independent vortex loop. This single-vortex instability is the generic precursor to turbulence. We investigate the instability with non-invasive NMR measurements on a rotating cylindrical sample in the intermediate temperature regime (0.3 - 0.6) Tc. From comparisons with numerical calculations we interpret that the instability occurs at the container wall, when the vortex end moves along the wall in applied flow.
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PDF链接:
https://arxiv.org/pdf/708.3003