Effective viscosity in quantum turbulence: A steady-state approach

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10291271" target="_blank" >RIV/00216208:11320/14:10291271 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/14:00431574

Result on the web

<a href="http://dx.doi.org/10.1209/0295-5075/106/24006" target="_blank" >http://dx.doi.org/10.1209/0295-5075/106/24006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1209/0295-5075/106/24006" target="_blank" >10.1209/0295-5075/106/24006</a>

Result language

angličtina

Original language name

Effective viscosity in quantum turbulence: A steady-state approach

Original language description

The concept of "effective viscosity" v(eff) of superfluid helium, widely used to interpret decaying turbulence, is tested in the steady-state case. We deduce.eff from measurements of the vortex line density, L, in a grid flow. The scaling of L with velocity confirms the validity of the heuristic relation defining v(eff), epsilon =v(eff) (kappa L)(2), where epsilon is the energy dissipation rate and. the circulation quantum. Within 1.17-2.16K, v(eff) is consistent with that from decays, allowing for uncertainties in flow parameters. Numerical simulations of the two-fluid equations yield a second estimation of v(eff) within an order of magnitude with all experiments. Its temperature dependence, more pronounced in numerics than experiments, shows a crossover from a viscous-dominated to a mutual-friction-based dissipation as temperature decreases, supporting the idea that the effective viscosity of a quantum turbulent flow is an indicator of the dissipative mechanisms at play.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BK - Liquid mechanics

OECD FORD branch

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Project

<a href="/en/project/GA14-02005S" target="_blank" >GA14-02005S: Cryogenic helium as a working fluid to study classical and quantum turbulence</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2014

Confidentiality

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

Name of the periodical

Europhysics Letters

ISSN

0295-5075

e-ISSN

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Volume of the periodical

106

Issue of the periodical within the volume

2

Country of publishing house

FR - FRANCE

Number of pages

6

Pages from-to

1-6

UT code for WoS article

000336376100009

EID of the result in the Scopus database

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