Ubiquity of particle-vortex interactions in turbulent counterflow of superfluid helium

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10424002" target="_blank" >RIV/00216208:11320/21:10424002 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23210/21:43961687

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zDQPOt0KOI" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=zDQPOt0KOI</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/jfm.2020.1017" target="_blank" >10.1017/jfm.2020.1017</a>

Result language

angličtina

Original language name

Ubiquity of particle-vortex interactions in turbulent counterflow of superfluid helium

Original language description

Thermal counterflow of superfluid He is investigated experimentally, by employing the particle tracking velocimetry technique. A flat heater, located at the bottom of a vertical channel of square cross-section, is used to generate this unique type of thermally driven flow. Micronic solid particles, made in situ, probe this quantum flow and their time-dependent positions are collected by a digital camera, in a plane perpendicular to the heat source, away from the channel walls. The experiments are performed at relatively large heating powers, resulting in fluid velocities exceeding , to ensure the existence of sufficiently dense tangles of quantized vortices. Within the investigated parameter range, we observe that the particles intermittently switch between two distinct motion regimes, along their trajectories, that is, a single particle can experience both regimes while travelling upward. The regimes can be loosely associated with fast particles, which are moving away from the heat source along almost straight tracks, and to slow particles, whose erratic upward motion can be said to be significantly influenced by quantized vortices. We propose a separation scheme to study the properties of these regimes and of the corresponding transients between them. We find that particles in both regimes display non-classical, broad distributions of velocity, which indicate the relevance of particle-vortex interactions in both cases. At the same time, we observe that the fast particles move along straighter trajectories than the slow ones, suggesting that the strength of particle-vortex interactions in the two regimes is notably different.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

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

Project

<a href="/en/project/GA19-00939S" target="_blank" >GA19-00939S: Dynamics of large vortices in quantum turbulence</a><br>

Continuities

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

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Fluid Mechanics

ISSN

0022-1120

e-ISSN

—

Volume of the periodical

911

Issue of the periodical within the volume

25 March 2021

Country of publishing house

GB - UNITED KINGDOM

Number of pages

22

Pages from-to

A8

UT code for WoS article

000611163300001

EID of the result in the Scopus database

2-s2.0-85100016591