Analysis of motion of solid hydrogen tracer particles in oscillating superfluid flows

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00439775" target="_blank" >RIV/68378271:_____/14:00439775 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/14:00486367

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1742-6596/568/1/012029" target="_blank" >http://dx.doi.org/10.1088/1742-6596/568/1/012029</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/568/1/012029" target="_blank" >10.1088/1742-6596/568/1/012029</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Analysis of motion of solid hydrogen tracer particles in oscillating superfluid flows

Popis výsledku v původním jazyce

We visualize turbulent flows in superfluid helium at temperatures below 2 K, using H_2 particles, and analyze velocity statistics of these tracers which follow the turbulent flow generated by oscillating bodies. We also study one of the oscillators in air at room temperature for comparison. The flow is characterized by a modified Reynolds number based on the viscous penetration depth. We compute with a particle tracking software the trajectories and velocities of tens of thousands of particles. For theoscillators in superfluid, the probability of finding particles at high velocities has an exponential decay. Within our resolution the statistics in the superfluid for oscillating objects with sharp borders is largely independent of Reynolds number, while the logarithmic decay at low velocities seems faster than for high velocities for rounded objects. For data taken in air the result is closer to a classical Gaussian distribution of velocities.

Název v anglickém jazyce

Analysis of motion of solid hydrogen tracer particles in oscillating superfluid flows

Popis výsledku anglicky

We visualize turbulent flows in superfluid helium at temperatures below 2 K, using H_2 particles, and analyze velocity statistics of these tracers which follow the turbulent flow generated by oscillating bodies. We also study one of the oscillators in air at room temperature for comparison. The flow is characterized by a modified Reynolds number based on the viscous penetration depth. We compute with a particle tracking software the trajectories and velocities of tens of thousands of particles. For theoscillators in superfluid, the probability of finding particles at high velocities has an exponential decay. Within our resolution the statistics in the superfluid for oscillating objects with sharp borders is largely independent of Reynolds number, while the logarithmic decay at low velocities seems faster than for high velocities for rounded objects. For data taken in air the result is closer to a classical Gaussian distribution of velocities.

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název statě ve sborníku

Journal of Physics: Conference Series

ISBN

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ISSN

1742-6588

e-ISSN

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Počet stran výsledku

5

Strana od-do

"012029-1"-"012029-5"

Název nakladatele

IOP Publishing Ltd

Místo vydání

Bristol

Místo konání akce

Buenos Aires

Datum konání akce

6. 8. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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