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Lookup NU author(s): Peter Stasiak, Professor Carlo Barenghi, Dr Andrew BaggaleyORCiD, Dr Luca Galantucci
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
Copyright © 2025 the Author(s).The minimum separation between reconnecting vortices in fluids and superfluids obeys a universal scaling law with respect to time. The prereconnection and the postreconnection prefactors of this scaling law are different, a property related to irreversibility and to energy transfer and dissipation mechanisms. In the present work, we determine the temperature dependence of these prefactors in superfluid helium from experiments and a numeric model which fully accounts for the coupled dynamics of the superfluid vortex lines and the thermal normal fluid component. At all temperatures, we observe a pre- and postreconnection asymmetry similar to that observed in other superfluids and in classical viscous fluids, indicating that vortex reconnections display a universal behavior independent of the small-scale regularizing dynamics. We also numerically show that each vortex reconnection event represents a sudden injection of energy in the normal fluid. Finally we argue that in a turbulent flow, these punctuated energy injections can sustain the normal fluid in a perturbed state, provided that the density of superfluid vortices is large enough.
Author(s): Stasiak PZ, Xing Y, Alihosseini Y, Barenghi CF, Baggaley A, Guo W, Galantucci L, Krstulovic G
Publication type: Article
Publication status: Published
Journal: Proceedings of the National Academy of Sciences of the United States of America
Year: 2025
Volume: 122
Issue: 21
Print publication date: 27/05/2025
Online publication date: 22/05/2025
Acceptance date: 09/04/2025
Date deposited: 09/06/2025
ISSN (print): 0027-8424
ISSN (electronic): 1091-6490
Publisher: National Academy of Sciences
URL: https://doi.org/10.1073/pnas.2426064122
DOI: 10.1073/pnas.2426064122
PubMed id: 40402248
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