Transition to quantum turbulence in oscillatory thermal counterflow of He-4

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10430349" target="_blank" >RIV/00216208:11320/21:10430349 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=2NgkRl6PLJ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=2NgkRl6PLJ</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.103.134516" target="_blank" >10.1103/PhysRevB.103.134516</a>

Result language

angličtina

Original language name

Transition to quantum turbulence in oscillatory thermal counterflow of He-4

Original language description

We report an experimental study of oscillatory thermal counterflow of superfluid He-4 and its transition to quantum turbulence inspired by the work of Kotsubo and Swift [ Phys. Rev. Lett. 62, 2604 (1989)]. We use a pair of transversally oriented second-sound sensors to provide direct proof that upon exceeding a critical heat flux, quantized vorticity is generated in the antinodes of the longitudinal resonances of the oscillating counterflow. Building on modern understanding of oscillatory flows of superfluid He-4 [D. Schmoranzer et al., Phys. Rev. B 99, 054511 (2019)], we re-evaluate the original data together with ours and provide grounds for the previously unexplained temperature dependence of critical velocities. Our analysis incorporates a classical flow instability in the normal component described by the dimensionless Donnelly number, which is shown to trigger quantum turbulence at temperatures below approximate to 1.7 K. This contrasts with the original interpretation based on the dynamics of quantized vortices, and we show that for oscillatory counterflow, such an approach is valid only at temperatures above approximate to 1.8 K. Finally, we demonstrate that the instabilities occurring in oscillatory counterflow are governed by the same underlying physics as those in flow due to submerged oscillators and propose a unified description of high Stokes number coflow and counterflow experiments.

Czech name

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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/GA20-00918S" target="_blank" >GA20-00918S: Interplay of convective heat transfer and turbulent flows with rotation in classical and quantum phases of cryogenic helium</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

Physical Review B

ISSN

2469-9950

e-ISSN

—

Volume of the periodical

103

Issue of the periodical within the volume

13

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

134516

UT code for WoS article

000646310800004

EID of the result in the Scopus database

2-s2.0-85105075824