The turbulent drag force in superfluid 3He−4He mixtures under oscillations of a quartz tuning fork

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00563788" target="_blank" >RIV/68378271:_____/21:00563788 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1063/10.0006059" target="_blank" >https://doi.org/10.1063/10.0006059</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/10.0006059" target="_blank" >10.1063/10.0006059</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The turbulent drag force in superfluid 3He−4He mixtures under oscillations of a quartz tuning fork

Popis výsledku v původním jazyce

We have studied the resonance curves of a quartz tuning fork of the fundamental frequency 32 kHz immersed in superfluid 4He and mixtures 3He–4He with 3He concentration of 5 and 15% in the temperature range of 0.35–2.5 K at saturated vapor pressure. Two types of experiments have been carried out, with a tuning fork both not covered by a bulb and coated by a bulb, i.e., in the restricted geometry. In both cases, the velocity-force dependences for the tuning fork showed a linear damping force at low peak velocities and extra drag due to the appearance of vortex lines accompanying the transition to turbulence under increasing peak velocity. These dependencies are mainly determined by the density of the normal helium component. There is a pronounced difference between superfluid 4He and mixtures of 3He in 4He, where 3He impurity particles provide a constant temperature-independent contribution to the normal component of the mixture.

Název v anglickém jazyce

The turbulent drag force in superfluid 3He−4He mixtures under oscillations of a quartz tuning fork

Popis výsledku anglicky

We have studied the resonance curves of a quartz tuning fork of the fundamental frequency 32 kHz immersed in superfluid 4He and mixtures 3He–4He with 3He concentration of 5 and 15% in the temperature range of 0.35–2.5 K at saturated vapor pressure. Two types of experiments have been carried out, with a tuning fork both not covered by a bulb and coated by a bulb, i.e., in the restricted geometry. In both cases, the velocity-force dependences for the tuning fork showed a linear damping force at low peak velocities and extra drag due to the appearance of vortex lines accompanying the transition to turbulence under increasing peak velocity. These dependencies are mainly determined by the density of the normal helium component. There is a pronounced difference between superfluid 4He and mixtures of 3He in 4He, where 3He impurity particles provide a constant temperature-independent contribution to the normal component of the mixture.

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

2021

Kód důvěrnosti údajů

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

Název periodika

Low Temperature Physics

ISSN

1063-777X

e-ISSN

1090-6517

Svazek periodika

47

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

RU - Ruská federace

Počet stran výsledku

7

Strana od-do

805-811

Kód UT WoS článku

000723255500001

EID výsledku v databázi Scopus

2-s2.0-85118840068