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Spherically Symmetric Counterflow Turbulence in Open Geometry.

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Title: Spherically Symmetric Counterflow Turbulence in Open Geometry.
Authors: Dunca, Tomáš1 (AUTHOR), Novotný, Filip1 (AUTHOR), Talíř, Marek1 (AUTHOR), Szalai, Balázs1 (AUTHOR), Ustinov, Nikita1 (AUTHOR), Skrbek, Ladislav1 (AUTHOR), Varga, Emil1 (AUTHOR) emil.varga@matfyz.cuni.cz
Source: Journal of Low Temperature Physics. Feb2026, Vol. 222 Issue 1, p1-10. 10p.
Subjects: Counterflows (Fluid dynamics), Liquid helium, Scaling laws (Statistical physics)
Abstract: We report preliminary results on spherical thermal counterflow generated by a small central heater in an open geometry, an open bath of superfluid He II, as closed cell experiments could have introduced artifacts such as overheating and boundary-induced flows. In order to eliminate them, we measure second sound attenuation in a plane-parallel resonator. Our results are at variance with the previous experiments in closed spherical cavity that showed plateau in the steady-state vortex line density and its inverse time decay, neither of which is observed presently. We find that in open geometry the vortex line density L increases steadily with counterflow velocity v ns , displaying a crossover between L ∝ v ns 2 typical for counterflow and L ∝ v ns 3 / 2 , characteristic for the quasi-classical scaling. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Low Temperature Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Spherically Symmetric Counterflow Turbulence in Open Geometry.
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  Data: <searchLink fieldCode="DE" term="%22Counterflows+%28Fluid+dynamics%29%22">Counterflows (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+helium%22">Liquid helium</searchLink><br /><searchLink fieldCode="DE" term="%22Scaling+laws+%28Statistical+physics%29%22">Scaling laws (Statistical physics)</searchLink>
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  Data: We report preliminary results on spherical thermal counterflow generated by a small central heater in an open geometry, an open bath of superfluid He II, as closed cell experiments could have introduced artifacts such as overheating and boundary-induced flows. In order to eliminate them, we measure second sound attenuation in a plane-parallel resonator. Our results are at variance with the previous experiments in closed spherical cavity that showed plateau in the steady-state vortex line density and its inverse time decay, neither of which is observed presently. We find that in open geometry the vortex line density L increases steadily with counterflow velocity v ns , displaying a crossover between L ∝ v ns 2 typical for counterflow and L ∝ v ns 3 / 2 , characteristic for the quasi-classical scaling. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Low Temperature Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=190246472
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        Value: 10.1007/s10909-025-03352-w
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      – SubjectFull: Liquid helium
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      – SubjectFull: Scaling laws (Statistical physics)
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              Text: Feb2026
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              Y: 2026
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