Second-sound studies of coflow and counterflow of superfluid He-4 in channels

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10320067" target="_blank" >RIV/00216208:11320/15:10320067 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.4921816" target="_blank" >http://dx.doi.org/10.1063/1.4921816</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4921816" target="_blank" >10.1063/1.4921816</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Second-sound studies of coflow and counterflow of superfluid He-4 in channels

Popis výsledku v původním jazyce

We report a comprehensive study of turbulent superfluid He-4 flow through a channel of square cross section. We study for the first time two distinct flow configurations with the same apparatus: coflow (normal and superfluid components move in the same direction), and counterflow (normal and superfluid components move in opposite directions). We realise also a variation of counterflow with the same relative velocity, but where the superfluid component moves while there is no net flow of the normal component through the channel, i.e., pure superflow. We use the second-sound attenuation technique to measure the density of quantised vortex lines in the temperature range 1.2 K less than or similar to T less than or similar to T-lambda approximate to 2.18 Kand for flow velocities from about 1 mm/s up to almost 1 m/s in fully developed turbulence. We find that both the steady-state and temporal decay of the turbulence significantly differ in the three flow configurations, yielding an intere

Název v anglickém jazyce

Second-sound studies of coflow and counterflow of superfluid He-4 in channels

Popis výsledku anglicky

We report a comprehensive study of turbulent superfluid He-4 flow through a channel of square cross section. We study for the first time two distinct flow configurations with the same apparatus: coflow (normal and superfluid components move in the same direction), and counterflow (normal and superfluid components move in opposite directions). We realise also a variation of counterflow with the same relative velocity, but where the superfluid component moves while there is no net flow of the normal component through the channel, i.e., pure superflow. We use the second-sound attenuation technique to measure the density of quantised vortex lines in the temperature range 1.2 K less than or similar to T less than or similar to T-lambda approximate to 2.18 Kand for flow velocities from about 1 mm/s up to almost 1 m/s in fully developed turbulence. We find that both the steady-state and temporal decay of the turbulence significantly differ in the three flow configurations, yielding an intere

Druh

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

CEP obor

BK - Mechanika tekutin

OECD FORD obor

—

Projekt

<a href="/cs/project/GA14-02005S" target="_blank" >GA14-02005S: Kryogenní helium jako pracovní látka pro studium klasické a kvantové turbulence</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Physics of Fluids

ISSN

1070-6631

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

21

Strana od-do

—

Kód UT WoS článku

000357688800038

EID výsledku v databázi Scopus

2-s2.0-84930960256