期刊
EPL
卷 106, 期 2, 页码 -出版社
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/106/24006
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资金
- Region Rhone-Alpes (CPER-CIRA)
- EQUIP@MESO
- P-ER grant [ANR-09-BLAN-0094]
- [GACR 203/14/02005S]
- [GAUK 366213]
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0094] Funding Source: Agence Nationale de la Recherche (ANR)
The concept of effective viscosity v(eff) of superfluid helium, widely used to interpret decaying turbulence, is tested in the steady-state case. We deduce.eff from measurements of the vortex line density, L, in a grid flow. The scaling of L with velocity confirms the validity of the heuristic relation defining v(eff), epsilon =v(eff) (kappa L)(2), where epsilon is the energy dissipation rate and. the circulation quantum. Within 1.17-2.16K, v(eff) is consistent with that from decays, allowing for uncertainties in flow parameters. Numerical simulations of the two-fluid equations yield a second estimation of v(eff) within an order of magnitude with all experiments. Its temperature dependence, more pronounced in numerics than experiments, shows a crossover from a viscous-dominated to a mutual-friction-based dissipation as temperature decreases, supporting the idea that the effective viscosity of a quantum turbulent flow is an indicator of the dissipative mechanisms at play. Copyright (C) EPLA, 2014
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