Flows of liquid He-4 due to oscillating grids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368521" target="_blank" >RIV/00216208:11320/17:10368521 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1017/jfm.2017.703" target="_blank" >http://dx.doi.org/10.1017/jfm.2017.703</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/jfm.2017.703" target="_blank" >10.1017/jfm.2017.703</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Flows of liquid He-4 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 approximately 1.3 to 2.5 K, resulting in suitably defined Reynolds numbers up to 10(5). We specifically study the flow-induced motions of small particles suspended in the fluid by using the particle tracking velocimetry technique. We focus on turbulent flows of superfluid He-4 that occur below approximately 2.2 K and 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 length scales, larger than the mean distance between quantized vortices, representing the quantum length scale of the flow, the shapes of the velocity and velocity increment statistical distributions are very similar to those obtained in turbulent flows of viscous fluids. The experimental outcome strongly supports the view that, in the range of investigated parameters, particles probing flows of superfluid He-4 behave as if they were tracking classical flows.

Název v anglickém jazyce

Flows of liquid He-4 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 approximately 1.3 to 2.5 K, resulting in suitably defined Reynolds numbers up to 10(5). We specifically study the flow-induced motions of small particles suspended in the fluid by using the particle tracking velocimetry technique. We focus on turbulent flows of superfluid He-4 that occur below approximately 2.2 K and 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 length scales, larger than the mean distance between quantized vortices, representing the quantum length scale of the flow, the shapes of the velocity and velocity increment statistical distributions are very similar to those obtained in turbulent flows of viscous fluids. The experimental outcome strongly supports the view that, in the range of investigated parameters, particles probing flows of superfluid He-4 behave as if they were tracking classical flows.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GA16-00580S" target="_blank" >GA16-00580S: Hranice kvantové turbulence</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Fluid Mechanics

ISSN

0022-1120

e-ISSN

—

Svazek periodika

832

Číslo periodika v rámci svazku

10 December 2017

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

578-599

Kód UT WoS článku

000413863100001

EID výsledku v databázi Scopus

2-s2.0-85033386431