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Lookup NU author(s): Professor Carlo Barenghi, Emeritus Professor Yuri Sergeev, Dr Andrew BaggaleyORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Experiments and numerical simulations of turbulent 4He and 3He-B have established that, at hydrodynamic length scales larger than the average distance between quantum vortices, the energy spectrum obeys the same 5/3 Kolmogorov law which is observed in the homogeneous isotropic turbulence of ordinary fluids. The importance of the 5/3 law is that it points to the existence of a Richardson energy cascade from large eddies to small eddies. However, there is also evidence of quantum turbulent regimes without Kolmogorov scaling. This raises the important questions of why, in such regimes, the Kolmogorov spectrum fails to form, what is the physical nature of turbulence without energy cascade, and whether hydrodynamical models can account for the unusual behaviour of turbulent superfluid helium. In this work we describe simple physical mechanisms which prevent the formation of Kolmogorov scaling in the thermal counterflow, and analyze the conditions necessary for emergence of quasiclassical regime in quantum turbulence generated by injection of vortex rings at low temperatures. Our models justify the hydrodynamical description of quantum turbulence and shed light into an unexpected regime of vortex dynamics.
Author(s): Barenghi CF, Sergeev YA, Baggaley AW
Publication type: Article
Publication status: Published
Journal: Scientific Reports
Year: 2016
Volume: 6
Online publication date: 20/10/2016
Acceptance date: 30/09/2016
Date deposited: 30/09/2016
ISSN (electronic): 2045-2322
Publisher: Nature Publishing Group
URL: http://dx.doi.org/10.1038/srep35701
DOI: 10.1038/srep35701
Data Access Statement: http://dx.doi.org/10.17634/101785-2
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