The Decay of Forced Turbulent Coflow of He II Past a Grid
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10291143" target="_blank" >RIV/00216208:11320/14:10291143 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/14:00427356
Result on the web
<a href="http://dx.doi.org/10.1007/s10909-013-0938-y" target="_blank" >http://dx.doi.org/10.1007/s10909-013-0938-y</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10909-013-0938-y" target="_blank" >10.1007/s10909-013-0938-y</a>
Alternative languages
Result language
angličtina
Original language name
The Decay of Forced Turbulent Coflow of He II Past a Grid
Original language description
We present an experimental study of the decay of He II turbulence created mechanically, by a bellows-induced flow past a stationary grid in a 7x7 mm(2) superfluid wind tunnel. The temporal decay L(t) originating from various steady-states of vortex linelength per unit volume, L (0), has been observed based on measurements of the attenuation of second-sound, in the temperature range 1.17 K < T < 1.95 K. Each presented decay curve is the average of up to 150 single decay events. We find that, independently of T and L (0), within seconds past the sudden stop of the drive, all the decay curves show a universal behavior lasting up to 200 s, of the form L(t)ae(t-t (0))(-3/2), where t (0) is the virtual origin time. From this decay process we deduce the effective kinematic viscosity of turbulent He II. We compare our results with the bench-mark Oregon towed grid experiments and, despite our turbulence being non-homogeneous, find strong similarities.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BK - Liquid mechanics
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GAP203%2F11%2F0442" target="_blank" >GAP203/11/0442: Visualization of liquid helium flows</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Low Temperature Physics
ISSN
0022-2291
e-ISSN
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Volume of the periodical
175
Issue of the periodical within the volume
1-2
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
324-330
UT code for WoS article
000332486200043
EID of the result in the Scopus database
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