Critical velocities in flows of superfluid 4He

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510747" target="_blank" >RIV/00216208:11320/25:10510747 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0262866" target="_blank" >10.1063/5.0262866</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Critical velocities in flows of superfluid 4He

Popis výsledku v původním jazyce

We review and discuss the underlying physics of critical velocities in flows of superfluid He-4 (for historical reasons known as He II). Critical velocities, which indicate changes in the character of quantum three-dimensional flows, are associated with intrinsic as well as extrinsic nucleation of quantized vortices or with generation of quasiparticles-phonons and rotons-and are affected by the length scale of a particular superflow. We consider both dc and ac flows of He II through channels and orifices, as well as flows due to moving or oscillating obstacles of various shapes and sizes in stationary He II. We also consider critical velocities associated with homogeneous and inhomogeneous cavitation, occurring in quantum as well as classical viscous flows of liquid He-4. We discuss relevant theoretical approaches leading to evaluations of critical velocities, focusing on the fundamental case of pure superflow of He II in the zero temperature limit and describe their experimental verification. Additionally, we point out the role of temperature in quantum flows of He II, describe various scenarios of transition to quantum turbulence, and discuss the crucial role of purity and history of the He II samples.

Název v anglickém jazyce

Critical velocities in flows of superfluid 4He

Popis výsledku anglicky

We review and discuss the underlying physics of critical velocities in flows of superfluid He-4 (for historical reasons known as He II). Critical velocities, which indicate changes in the character of quantum three-dimensional flows, are associated with intrinsic as well as extrinsic nucleation of quantized vortices or with generation of quasiparticles-phonons and rotons-and are affected by the length scale of a particular superflow. We consider both dc and ac flows of He II through channels and orifices, as well as flows due to moving or oscillating obstacles of various shapes and sizes in stationary He II. We also consider critical velocities associated with homogeneous and inhomogeneous cavitation, occurring in quantum as well as classical viscous flows of liquid He-4. We discuss relevant theoretical approaches leading to evaluations of critical velocities, focusing on the fundamental case of pure superflow of He II in the zero temperature limit and describe their experimental verification. Additionally, we point out the role of temperature in quantum flows of He II, describe various scenarios of transition to quantum turbulence, and discuss the crucial role of purity and history of the He II samples.

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/GA25-16588S" target="_blank" >GA25-16588S: Kvantová turbulence v rotujícím supratekutém 4He</a><br>

Návaznosti

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

Rok uplatnění

2025

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

37

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

031305

Kód UT WoS článku

001450480500027

EID výsledku v databázi Scopus

2-s2.0-105000473205