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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BK - Liquid mechanics

OECD FORD branch

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Project

<a href="/en/project/GA14-02005S" target="_blank" >GA14-02005S: Cryogenic helium as a working fluid to study classical and quantum turbulence</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2015

Confidentiality

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

Name of the periodical

Physics of Fluids

ISSN

1070-6631

e-ISSN

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Volume of the periodical

27

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

21

Pages from-to

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UT code for WoS article

000357688800038

EID of the result in the Scopus database

2-s2.0-84930960256