Generation of turbulence by oscillating structures in superfluid helium at very low temperatures
Generation of turbulence by oscillating structures in superfluid helium at very low temperatures
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DOI：
10.1103/physrevb.75.064502
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发表时间：
2006-10
影响因子：
3.7
通讯作者：
R. Hänninen;M. Tsubota;W. Vinen
中科院分区：
文献类型：
--
作者：
R. Hänninen;M. Tsubota;W. Vinen
本文对最近报道的许多实验进行了解释，这些实验是在{sup 4}He和{sup 3}He-B中振荡球、线和网格产生量子湍流，温度很低，正常流体的比例可以忽略不计。实验结果进行了比较，在类似的实验与经典流体和初步模拟的量子湍流。特别注意观察值的阻力系数和非常不同的临界速度观察到的{sup 4}他和{sup 3}他。它是暂时得出结论，在{sup 4}He的行为的情况下，可以很好地类似于在经典的类似物中观察到的，与相对较小的变化时，振荡结构的特征尺寸相比，量子化的涡旋间距不大，但在{sup 3}He的行为是非常不同的情况下，可能是由于非常快速的内在成核的量子化的涡旋。
The paper is concerned with the interpretation of many experiments that have been reported recently on the production of quantum turbulence by oscillating spheres, wires and grids in both {sup 4}He and {sup 3}He-B at temperatures so low that there is a negligible fraction of normal fluid. The experimental results are compared with those obtained in analogous experiments with classical fluids and with preliminary simulations of the quantum turbulence. Particular attention is paid to observed values of drag coefficients and to the very different critical velocities observed in {sup 4}He and {sup 3}He. It is tentatively concluded that in the case of {sup 4}He behavior may well be similar to that observed in the classical analogues, with relatively small changes when the characteristic size of the oscillating structure is not large compared with the quantized vortex spacing, but that in the case of {sup 3}He behavior is very different and due perhaps to very rapid intrinsic nucleation of the quantized vortices.