Disentangling temperature and Reynolds number effects in quantum turbulence.

ABSTRACT: The interplay between viscous and frictional dissipation is key to understanding quantum turbulence dynamics in superfluid ⁴He. Based on a coarse-grained two-fluid description, an original scale-by-scale energy budget that identifies each scale's contribution to energy dissipation is derived. Using the Hall-Vinen-Bekharevich-Khalatnikov (HVBK) model to further characterize mutual friction, direct numerical simulations at temperatures 1.44 K ≲ T ≲ 2.16 K indicate that mutual friction promotes intense momentum exchanges between the two fluids to maintain a joint energy cascade despite their viscosity mismatch. However, the resulting overall frictional dissipation remains small (compared to the viscous dissipation) and confined to far-dissipative scales. This remarkable feat

SUBMITTER: Polanco JI 

PROVIDER: S-EPMC12260400 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature