Spherically symmetric counterflow turbulence in open geometry Article Swipe

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Filip Novotný , Marek Talíř , Balázs Szalai , Nikita Ustinov , L. Skrbek , Emil Varga ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2509.14103

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 $v_\mathrm{ns}$, displaying a crossover between $L \propto v_\mathrm{ns}^2$ typical for counterflow and $L \propto v_\mathrm{ns}^{3/2}$, characteristic for the quasi-classical scaling.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2509.14103
PDF: https://arxiv.org/pdf/2509.14103
OA Status: green
OpenAlex ID: https://openalex.org/W4416255734

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DOI: https://doi.org/10.48550/arxiv.2509.14103

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Title: Spherically symmetric counterflow turbulence in open geometry

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-09-17

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Authors: Filip Novotný, Marek Talíř, Balázs Szalai, Nikita Ustinov, L. Skrbek, Emil Varga

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Landing page: https://arxiv.org/abs/2509.14103

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PDF URL: https://arxiv.org/pdf/2509.14103

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