Dynamics of quantum turbulence in axially rotating thermal counterflow

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F24%3A00599448" target="_blank" >RIV/68081731:_____/24:00599448 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/24:10494310

Výsledek na webu

<a href="https://pubs.aip.org/aip/pof/article/36/10/105121/3315391/Dynamics-of-quantum-turbulence-in-axially-rotating" target="_blank" >https://pubs.aip.org/aip/pof/article/36/10/105121/3315391/Dynamics-of-quantum-turbulence-in-axially-rotating</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0227282" target="_blank" >10.1063/5.0227282</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics of quantum turbulence in axially rotating thermal counterflow

Popis výsledku v původním jazyce

Generation, statistically steady state, and temporal decay of axially rotating thermal counterflow of superfluid 4He (He II) in a square channel is probed using the second sound attenuation technique, measuring the density of quantized vortex lines. The array of rectilinear quantized vortices created by rotation strongly affects the development of quantum turbulence (i.e., turbulence strongly affected by the presence of quantized vortices). At relatively slow angular velocities, the type of instability responsible for the destruction of the laminar counterflow qualitatively changes: the growth of seed vortex loops pinned on the channel wall becomes gradually replaced by the growth due to Donnelly-Glaberson instability, which leads to rapid growth of helical Kelvin waves on vortices parallel with applied counterflow. The initial transient growth of vortex line density that follows the sudden start of the counterflow appears self-similar, linear in dimensionless time, Omega t. We show numerically that Kelvin waves of sufficiently strong amplitude reorient the vortices into more flattened shapes, which grow similarly to a free vortex ring. The observed steady state vortex line density at sufficiently high counterflow velocity and its early temporal decay after the counterflow is switched off are not appreciably affected by rotation. It is striking, however, that although the steady state of rotating counterflow is very different from rotating classical grid-generated turbulence, the late temporal decay of both displays similar features: the decay exponent decreases with the rotation rate Omega from3/2 toward approximately0.7, typical for two-dimensional turbulence, consistent with the transition to bidirectional cascade. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) license

Název v anglickém jazyce

Dynamics of quantum turbulence in axially rotating thermal counterflow

Popis výsledku anglicky

Generation, statistically steady state, and temporal decay of axially rotating thermal counterflow of superfluid 4He (He II) in a square channel is probed using the second sound attenuation technique, measuring the density of quantized vortex lines. The array of rectilinear quantized vortices created by rotation strongly affects the development of quantum turbulence (i.e., turbulence strongly affected by the presence of quantized vortices). At relatively slow angular velocities, the type of instability responsible for the destruction of the laminar counterflow qualitatively changes: the growth of seed vortex loops pinned on the channel wall becomes gradually replaced by the growth due to Donnelly-Glaberson instability, which leads to rapid growth of helical Kelvin waves on vortices parallel with applied counterflow. The initial transient growth of vortex line density that follows the sudden start of the counterflow appears self-similar, linear in dimensionless time, Omega t. We show numerically that Kelvin waves of sufficiently strong amplitude reorient the vortices into more flattened shapes, which grow similarly to a free vortex ring. The observed steady state vortex line density at sufficiently high counterflow velocity and its early temporal decay after the counterflow is switched off are not appreciably affected by rotation. It is striking, however, that although the steady state of rotating counterflow is very different from rotating classical grid-generated turbulence, the late temporal decay of both displays similar features: the decay exponent decreases with the rotation rate Omega from3/2 toward approximately0.7, typical for two-dimensional turbulence, consistent with the transition to bidirectional cascade. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) license

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Physics of Fluids

ISSN

1070-6631

e-ISSN

1089-7666

Svazek periodika

36

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

105121

Kód UT WoS článku

001328568900046

EID výsledku v databázi Scopus

2-s2.0-85205971189