Visualization of viscous and quantum flows of liquid He-4 due to an oscillating cylinder of rectangular cross section

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10320072" target="_blank" >RIV/00216208:11320/15:10320072 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.92.064519" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.92.064519</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.92.064519" target="_blank" >10.1103/PhysRevB.92.064519</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Visualization of viscous and quantum flows of liquid He-4 due to an oscillating cylinder of rectangular cross section

Popis výsledku v původním jazyce

The motions of micrometer-sized solid deuterium particles in liquid He-4, at temperatures between approximately 1.2 and 3 K, are visualized in the proximity of an oscillating cylinder of rectangular cross section (3 mm high and 10 mm wide). The cylinderis oscillating vertically, perpendicularly to its cross-section width, at frequencies between 0.05 and 1.25 Hz, and amplitudes of 5 and 10 mm, resulting in Reynolds numbers Re up to 10(5). The aim of the reported experiments is to investigate systematically the macroscopic vortical structures shed at the cylinder sharp edges, by tracking the deuterium particles. We find that large-scale, millimeter-sized vortices are generated in the surrounding fluid by the oscillating cylinder, both in viscous He I and superfluid He II. An estimate of the strength of the shed vortical structures reveals that, for Re > 10(4), the corresponding magnitudes are approximately equal in He I and He II if, in He II, the kinematic viscosity is suitably defined

Název v anglickém jazyce

Visualization of viscous and quantum flows of liquid He-4 due to an oscillating cylinder of rectangular cross section

Popis výsledku anglicky

The motions of micrometer-sized solid deuterium particles in liquid He-4, at temperatures between approximately 1.2 and 3 K, are visualized in the proximity of an oscillating cylinder of rectangular cross section (3 mm high and 10 mm wide). The cylinderis oscillating vertically, perpendicularly to its cross-section width, at frequencies between 0.05 and 1.25 Hz, and amplitudes of 5 and 10 mm, resulting in Reynolds numbers Re up to 10(5). The aim of the reported experiments is to investigate systematically the macroscopic vortical structures shed at the cylinder sharp edges, by tracking the deuterium particles. We find that large-scale, millimeter-sized vortices are generated in the surrounding fluid by the oscillating cylinder, both in viscous He I and superfluid He II. An estimate of the strength of the shed vortical structures reveals that, for Re > 10(4), the corresponding magnitudes are approximately equal in He I and He II if, in He II, the kinematic viscosity is suitably defined

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/GAP203%2F11%2F0442" target="_blank" >GAP203/11/0442: Vizualizace proudění kapalného helia</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

Physical Review B - Condensed Matter and Materials Physics

ISSN

1098-0121

e-ISSN

—

Svazek periodika

92

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000362207500005

EID výsledku v databázi Scopus

2-s2.0-84941097270