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Description
| - The concept of %22effective viscosity%22 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.
- The concept of %22effective viscosity%22 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. (en)
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Title
| - Effective viscosity in quantum turbulence: A steady-state approach
- Effective viscosity in quantum turbulence: A steady-state approach (en)
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skos:prefLabel
| - Effective viscosity in quantum turbulence: A steady-state approach
- Effective viscosity in quantum turbulence: A steady-state approach (en)
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skos:notation
| - RIV/00216208:11320/14:10291271!RIV15-MSM-11320___
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/00216208:11320/14:10291271
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - energy; decay; he-ii; finite channel; superfluid turbulence; homogeneous turbulence; helium-ii; grid-generated turbulence (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - FR - Francouzská republika
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Skrbek, Ladislav
- Babuin, Simone
- Varga, Emil
- Leveque, Emmanuel
- Roche, Philippe-E.
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http://linked.open...ain/vavai/riv/wos
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issn
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number of pages
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http://bibframe.org/vocab/doi
| - 10.1209/0295-5075/106/24006
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http://localhost/t...ganizacniJednotka
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