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Spherically Symmetric Counterflow Turbulence in Open Geometry.

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Bibliographic Details
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]
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Database:	Engineering Source

Description
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]
ISSN:	00222291
DOI:	10.1007/s10909-025-03352-w