Crossover from hydrodynamic to acoustic drag on quartz tuning forks in normal and superfluid He-4

Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10130784" target="_blank" >RIV/00216208:11320/12:10130784 - isvavai.cz</a>
Výsledek na webu
<a href="http://dx.doi.org/10.1103/PhysRevB.85.014501" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.85.014501</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.85.014501" target="_blank" >10.1103/PhysRevB.85.014501</a>

Jazyk výsledku
angličtina
Název v původním jazyce
Crossover from hydrodynamic to acoustic drag on quartz tuning forks in normal and superfluid He-4
Popis výsledku v původním jazyce
We present measurements of the drag forces on quartz tuning forks oscillating at low velocities in normal and superfluid He-4. We have investigated the dissipative drag over a wide range of frequencies, from 6.5 to 600 kHz, by using arrays of forks withvarying prong lengths and by exciting the forks in their fundamental and first overtone modes. At low frequencies the behavior is dominated by laminar hydrodynamic drag, governed by the fluid viscosity. At higher frequencies acoustic drag is dominant andis described well by a three-dimensional model of sound emission.
Název v anglickém jazyce
Crossover from hydrodynamic to acoustic drag on quartz tuning forks in normal and superfluid He-4
Popis výsledku anglicky
We present measurements of the drag forces on quartz tuning forks oscillating at low velocities in normal and superfluid He-4. We have investigated the dissipative drag over a wide range of frequencies, from 6.5 to 600 kHz, by using arrays of forks withvarying prong lengths and by exciting the forks in their fundamental and first overtone modes. At low frequencies the behavior is dominated by laminar hydrodynamic drag, governed by the fluid viscosity. At higher frequencies acoustic drag is dominant andis described well by a three-dimensional model of sound emission.

Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
BK - Mechanika tekutin
OECD FORD obor
—

Projekt
<a href="/cs/project/GA202%2F08%2F0276" target="_blank" >GA202/08/0276: Vybrané problémy kryogenní dynamiky tekutin</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění
2012
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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