About: Effective viscosity in quantum turbulence: A steady-state approach

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1209/0295-5075/106/24006
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)
Title	Effective viscosity in quantum turbulence: A steady-state approach Effective viscosity in quantum turbulence: A steady-state approach (en)
skos:prefLabel	Effective viscosity in quantum turbulence: A steady-state approach Effective viscosity in quantum turbulence: A steady-state approach (en)
skos:notation	RIV/00216208:11320/14:10291271!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P S
http://linked.open...avai/riv/aktivity	I, P(GA14-02005S), S
http://linked.open...iv/cisloPeriodika	2
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Varga, Emil Skrbek, Ladislav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	13643
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10291271
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	energy; decay; he-ii; finite channel; superfluid turbulence; homogeneous turbulence; helium-ii; grid-generated turbulence (en)
http://linked.open.../riv/klicoveSlovo	finite channel he-ii helium-ii decay energy grid-generated turbulence homogeneous turbulence superfluid turbulence
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[EAA7428BC50A]
http://linked.open...i/riv/nazevZdroje	Europhysics Letters
http://linked.open...in/vavai/riv/obor	BK
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Cryogenic helium as a working fluid to study classical and quantum turbulence
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	106
http://linked.open...iv/tvurceVysledku	Skrbek, Ladislav Babuin, Simone Varga, Emil Leveque, Emmanuel Roche, Philippe-E.
http://linked.open...ain/vavai/riv/wos	000336376100009
issn	0295-5075
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1209/0295-5075/106/24006
http://localhost/t...ganizacniJednotka	11320

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