Quantum turbulence of bellows-driven He-4 superflow: Steady state

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10130954" target="_blank" >RIV/00216208:11320/12:10130954 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.86.134515" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.86.134515</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.86.134515" target="_blank" >10.1103/PhysRevB.86.134515</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum turbulence of bellows-driven He-4 superflow: Steady state

Popis výsledku v původním jazyce

Quantum turbulence in superfluid He-4 is studied by the attenuation of second sound in flow channels of 7-mm and 10-mm side square cross sections, and 115-mm length. The ends of the channels are plugged by sintered silver superleaks to allow a pure superflow (i.e., a net flow of the superfluid component only). Flows are generated by mechanically operating a low temperature bellows assembly, as opposed to the helium fountain pump commonly used for previous superflow turbulence studies. The temperature range is 1.35 K {= T {= 1.95 K, at the saturated vapor pressure. The observed turbulent steady state is characterized by the vortex line density L-1/2 = gamma(T)(v - v(c)), where v is the mean superflow velocity and v(c) is the critical velocity for the onset of turbulence. The character of the steady state agrees with the Vinen phenomenological model for thermal counterflow turbulence. The coefficient gamma(T) is in fair agreement with previous thermal pure superflow and counterflow exper

Název v anglickém jazyce

Quantum turbulence of bellows-driven He-4 superflow: Steady state

Popis výsledku anglicky

Quantum turbulence in superfluid He-4 is studied by the attenuation of second sound in flow channels of 7-mm and 10-mm side square cross sections, and 115-mm length. The ends of the channels are plugged by sintered silver superleaks to allow a pure superflow (i.e., a net flow of the superfluid component only). Flows are generated by mechanically operating a low temperature bellows assembly, as opposed to the helium fountain pump commonly used for previous superflow turbulence studies. The temperature range is 1.35 K {= T {= 1.95 K, at the saturated vapor pressure. The observed turbulent steady state is characterized by the vortex line density L-1/2 = gamma(T)(v - v(c)), where v is the mean superflow velocity and v(c) is the critical velocity for the onset of turbulence. The character of the steady state agrees with the Vinen phenomenological model for thermal counterflow turbulence. The coefficient gamma(T) is in fair agreement with previous thermal pure superflow and counterflow exper

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

<a href="/cs/project/GA202%2F08%2F0276" target="_blank" >GA202/08/0276: Vybrané problémy kryogenní dynamiky tekutin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B - Condensed Matter and Materials Physics

ISSN

1098-0121

e-ISSN

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Svazek periodika

86

Číslo periodika v rámci svazku

13

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

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Kód UT WoS článku

000309728800007

EID výsledku v databázi Scopus

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