Joint Quantum Centre Durham-Newcastle and School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom.
Proc Natl Acad Sci U S A. 2014 Mar 25;111 Suppl 1(Suppl 1):4683-90. doi: 10.1073/pnas.1312548111. Epub 2014 Mar 24.
Turbulence in superfluid helium is unusual and presents a challenge to fluid dynamicists because it consists of two coupled, interpenetrating turbulent fluids: the first is inviscid with quantized vorticity, and the second is viscous with continuous vorticity. Despite this double nature, the observed spectra of the superfluid turbulent velocity at sufficiently large length scales are similar to those of ordinary turbulence. We present experimental, numerical, and theoretical results that explain these similarities, and illustrate the limits of our present understanding of superfluid turbulence at smaller scales.
超流氦中的湍流很不寻常，给流体动力学家带来了挑战，因为它由两种相互渗透的湍流流体组成：第一种是无粘性的，具有量子涡度，第二种是粘性的，具有连续涡度。尽管具有这种双重性质，但在足够大的长度尺度上观察到的超流湍流速度的谱与普通湍流的谱相似。我们提出了实验、数值和理论结果，解释了这些相似性，并说明了我们目前对较小尺度上超流湍流理解的局限性。
