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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F14%3A10291271%21RIV15-MSM-11320___
rdf:type
n20:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1209/0295-5075/106/24006
dcterms: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.
dcterms:title
Effective viscosity in quantum turbulence: A steady-state approach Effective viscosity in quantum turbulence: A steady-state approach
skos:prefLabel
Effective viscosity in quantum turbulence: A steady-state approach Effective viscosity in quantum turbulence: A steady-state approach
skos:notation
RIV/00216208:11320/14:10291271!RIV15-MSM-11320___
n4:aktivita
n8:S n8:P n8:I
n4:aktivity
I, P(GA14-02005S), S
n4:cisloPeriodika
2
n4:dodaniDat
n11:2015
n4:domaciTvurceVysledku
n9:4715314 n9:2994755
n4:druhVysledku
n5:J
n4:duvernostUdaju
n13:S
n4:entitaPredkladatele
n17:predkladatel
n4:idSjednocenehoVysledku
13643
n4:idVysledku
RIV/00216208:11320/14:10291271
n4:jazykVysledku
n19:eng
n4:klicovaSlova
energy; decay; he-ii; finite channel; superfluid turbulence; homogeneous turbulence; helium-ii; grid-generated turbulence
n4:klicoveSlovo
n7:decay n7:superfluid%20turbulence n7:he-ii n7:helium-ii n7:homogeneous%20turbulence n7:finite%20channel n7:grid-generated%20turbulence n7:energy
n4:kodStatuVydavatele
FR - Francouzská republika
n4:kontrolniKodProRIV
[EAA7428BC50A]
n4:nazevZdroje
Europhysics Letters
n4:obor
n15:BK
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
5
n4:projekt
n16:GA14-02005S
n4:rokUplatneniVysledku
n11:2014
n4:svazekPeriodika
106
n4:tvurceVysledku
Babuin, Simone Skrbek, Ladislav Roche, Philippe-E. Varga, Emil Leveque, Emmanuel
n4:wos
000336376100009
s:issn
0295-5075
s:numberOfPages
6
n12:doi
10.1209/0295-5075/106/24006
n10:organizacniJednotka
11320