Newtonian-like behaviour of starting vortex flow in superfluid helium at high Reynolds numbers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10500733" target="_blank" >RIV/00216208:11320/25:10500733 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=c2uJBB4okW" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=c2uJBB4okW</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/jfm.2025.10337" target="_blank" >10.1017/jfm.2025.10337</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Newtonian-like behaviour of starting vortex flow in superfluid helium at high Reynolds numbers

Popis výsledku v původním jazyce

We study experimentally the starting vortices shed by airfoils accelerating uniformly from rest in superfluid helium-4 (He II). The vortices behave apparently as if they were moving in a classical Newtonian fluid, such as air or water. Specifically, the starting vortex positions obtained from the experimental data are found to be very close to those computed numerically in a Newtonian fluid, at sufficiently small times, when self-similar behaviour is expected to occur, and for Reynolds numbers ranging between approximately $5 times 10&lt;^&gt;2$ and $5 times 10&lt;^&gt;5$ . The result indicates neatly that turbulent flows of He II can be very similar to classical flows of Newtonian fluids, when thermal effects can be neglected and at sufficiently large flow scales, i.e. the study demonstrates that He II could also be employed to study classical Newtonian flows.

Název v anglickém jazyce

Newtonian-like behaviour of starting vortex flow in superfluid helium at high Reynolds numbers

Popis výsledku anglicky

We study experimentally the starting vortices shed by airfoils accelerating uniformly from rest in superfluid helium-4 (He II). The vortices behave apparently as if they were moving in a classical Newtonian fluid, such as air or water. Specifically, the starting vortex positions obtained from the experimental data are found to be very close to those computed numerically in a Newtonian fluid, at sufficiently small times, when self-similar behaviour is expected to occur, and for Reynolds numbers ranging between approximately $5 times 10&lt;^&gt;2$ and $5 times 10&lt;^&gt;5$ . The result indicates neatly that turbulent flows of He II can be very similar to classical flows of Newtonian fluids, when thermal effects can be neglected and at sufficiently large flow scales, i.e. the study demonstrates that He II could also be employed to study classical Newtonian flows.

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/LL2326" target="_blank" >LL2326: Jak je možné létání v supratekutině? Zkoumání generování vztlaku v kapalném heliu-4 za účelem identifikace jeho newtonských rysů</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

Journal of Fluid Mechanics

ISSN

0022-1120

e-ISSN

1469-7645

Svazek periodika

1015

Číslo periodika v rámci svazku

23 July 2025

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

A57

Kód UT WoS článku

001532917700001

EID výsledku v databázi Scopus

2-s2.0-105011377389