Velocity Circulation Intermittency in Finite-Temperature Turbulent Superfluid Helium

Circulation scaling exponent in classical and finite temperature quantum turbulence

Abstract

We study intermittency of circulation moments in turbulent superfluid helium by using experimental grid turbulence and numerical simulations of the Hall-Vinen-Bekarevich-Khalatnikov model. More precisely, we compute the velocity circulation $Γ_r$ in loops of size $r$ laying in the inertial range. For both, experimental and numerical data, the circulation variance shows a clear Kolmogorov scaling $<Γ^2_r>∼r^{8/3}$ in the inertial range, independently of the temperature. Scaling exponents of high-order moments are comparable, within error bars, to previously reported anomalous circulation exponents in classical turbulence and low-temperature quantum turbulence numerical simulations.

Type
Publication
Phys. Rev. Fluids 7, 104604 (2022)