Turbulence without inertia in quantum fluids

Numerical calculations of Helium-II hydrodynamics show that a dense tangle of superfluid vortices induces in an initially stationary normal fluid a highly dissipative, complex, vortical flow pattern ("turbulence") with a -2.2 energy spectrum scaling exponent and fluctuations Reynolds number of order unity. In this normal fluid flow the effects of mutual friction excitation from the superfluid vortices and those of viscous stresses are of the same order. The results suggest that in previous experiments the dynamics of decaying, high Reynolds number, quantum turbulent flows could only weakly be affected by the quantized vortices. As a consequence, their energy spectra would be (to a very good approximation) the classical, Navier-Stokes type, energy spectra of the normal fluid component.