Particle Dynamics in 4He Flows Due to Oscillating Grids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368511" target="_blank" >RIV/00216208:11320/17:10368511 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.14311/TPFM.2017.037" target="_blank" >http://dx.doi.org/10.14311/TPFM.2017.037</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/TPFM.2017.037" target="_blank" >10.14311/TPFM.2017.037</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Particle Dynamics in 4He Flows Due to Oscillating Grids

Popis výsledku v původním jazyce

We investigate cryogenic flows of liquid He-4 between two grids oscillating in phase, at temperatures ranging from about 1.3 to 2.5 K, by following the motions of small particles suspended in the fluid. We focus on flows of superfluid He-4, which are known to display, in certain conditions, features different from those observed in flows of classical viscous fluids, such as water. We find that, at large enough flow scales, the shapes of the velocity and velocity increment statistical distributions are very similar to those obtained in turbulent flows of viscous fluids. The outcome reinforces the idea that, above 1 K and at large enough length scales, particles probing flows of superfluid He-4 behave as they were tracking classical flows, regardless of the mechanism of flow generation.

Název v anglickém jazyce

Particle Dynamics in 4He Flows Due to Oscillating Grids

Popis výsledku anglicky

We investigate cryogenic flows of liquid He-4 between two grids oscillating in phase, at temperatures ranging from about 1.3 to 2.5 K, by following the motions of small particles suspended in the fluid. We focus on flows of superfluid He-4, which are known to display, in certain conditions, features different from those observed in flows of classical viscous fluids, such as water. We find that, at large enough flow scales, the shapes of the velocity and velocity increment statistical distributions are very similar to those obtained in turbulent flows of viscous fluids. The outcome reinforces the idea that, above 1 K and at large enough length scales, particles probing flows of superfluid He-4 behave as they were tracking classical flows, regardless of the mechanism of flow generation.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

TOPICAL PROBLEMS OF FLUID MECHANICS 2017

ISBN

978-80-87012-61-1

ISSN

2336-5781

e-ISSN

neuvedeno

Počet stran výsledku

8

Strana od-do

295-302

Název nakladatele

ACAD SCI CZECH REPUBLIC, INST THERMOMECHANICS

Místo vydání

PRAGUE 8

Místo konání akce

Acad Sci Czech Republ,Inst Thermomechan, Prague

Datum konání akce

15. 2. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000404424300037