Flows of liquid He-4 due to oscillating grids

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368521" target="_blank" >RIV/00216208:11320/17:10368521 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1017/jfm.2017.703" target="_blank" >http://dx.doi.org/10.1017/jfm.2017.703</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1017/jfm.2017.703" target="_blank" >10.1017/jfm.2017.703</a>

Result language
angličtina
Original language name
Flows of liquid He-4 due to oscillating grids
Original language description
We investigate cryogenic flows of liquid He-4 between two grids oscillating in phase, at temperatures ranging from approximately 1.3 to 2.5 K, resulting in suitably defined Reynolds numbers up to 10(5). We specifically study the flow-induced motions of small particles suspended in the fluid by using the particle tracking velocimetry technique. We focus on turbulent flows of superfluid He-4 that occur below approximately 2.2 K and are known to display, in certain conditions, features different from those observed in flows of classical viscous fluids, such as water. We find that, at large enough length scales, larger than the mean distance between quantized vortices, representing the quantum length scale of the flow, the shapes of the velocity and velocity increment statistical distributions are very similar to those obtained in turbulent flows of viscous fluids. The experimental outcome strongly supports the view that, in the range of investigated parameters, particles probing flows of superfluid He-4 behave as if they were tracking classical flows.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GA16-00580S" target="_blank" >GA16-00580S: Quantum turbulence boundaries</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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