Quantum, or classical turbulence?
Quantum, or classical turbulence?
复制标题
DOI：
10.1209/0295-5075/105/46002
复制
发表时间：
2014-02-01
期刊：
影响因子：
1.8
通讯作者：
Skrbek, L.
中科院分区：
文献类型：
--
作者：
La Mantia, M.;Skrbek, L.
我们的实验答案是，在超流体He-4的热逆流中，可以同时检测到湍流的量子特征和经典特征，这取决于探测该量子流的长度尺度。我们在长度尺度l（exp）上研究它横跨两个数量级，跨越量子化漩涡之间的平均距离l。采用粒子跟踪测速技术研究了粒径d近似为1 /10的固体氘粒子的拉格朗日动力学。粒子速度的归一化概率分布在尺度l（exp）小于或类似于l时，从量子湍流的幂律形状变为典型的经典湍流的近高斯形状，尺度l（exp）大于或类似于l。Copyright (C) EPLA, 2014
Our experimental answer is that in thermal counterflow of superfluid He-4 both quantum and classical characteristics of turbulence can be detected simultaneously, depending on the length scale at which this quantum flow is probed. We study it at length scales l(exp) straddling two orders of magnitude across the average distance l between quantized vortices. The Lagrangian dynamics of solid deuterium particles of size d approximate to l/10 is investigated by using the particle tracking velocimetry technique. The normalized probability distribution of the particle velocity changes from the power-law shape typical of quantum turbulence, at scales l(exp) less than or similar to l, to the nearly Gaussian form typical of classical turbulent flows, at l(exp) greater than or similar to l. Copyright (C) EPLA, 2014