Time-of-Flight Experiments of Vortex Rings Propagating from Turbulent Region of Superfluid He-4 at High Temperature
Time-of-Flight Experiments of Vortex Rings Propagating from Turbulent Region of Superfluid He-4 at High Temperature
复制标题
高温超流He-4湍流区涡环传播的飞行时间实验
DOI：
10.1007/s10909-010-0277-1
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
et. al.
中科院分区：
文献类型：
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作者：
Y. Nago;T. Ogawa;K. Obara;et. al.
本文报道了在含有正常流体组分的超流4He中，由振弦产生的量子化涡环的飞行时间。振动金属丝的盖盒和超流体的缓慢冷却减少了附着在金属丝表面的涡旋数量，使我们能够研究从湍流区域传播的涡环。用两根振弦作为涡旋发生器和涡旋探测器，在1.25K下测量了传播距离为0.88 mm的涡旋的飞行时间，发现飞行时间分布在0.06 S到27.4K之间，远远大于发电机振幅大小限制的圆形涡环的寿命。这些结果表明，发生器产生了大的非圆形涡环或涡旋缠结，传播缓慢，在完全消失之前与探测器相撞。
We report the time-of-flight of quantized vortex rings generated by a vibrating wire in superfluid4He which contains normal fluid component. A cover box of vibrating wires and slow cooling of superfluid reduce the number of vortices attached to wire surfaces, enabling us to study vortex rings propagating from a turbulent region. Using two vibrating wires as a generator and a detector of vortices, the time-of-flight of vortices propagating a distance of 0.88 mm was measured at 1.25 K. We find that the time-of-flights distribute from 0.06 s to 27.4 s, much larger than the lifetimes of circular vortex rings limited in the size of a generator amplitude. These results imply that large vortex rings with non-circular shape or vortex tangles are created by the generator, propagating slowly and colliding with the detector before complete disappearance.