How is turbulent energy dissipated in a superfluid?

At a sufficiently large Reynolds number the flow of a classical fluid becomes turbulent. Typically, turbulent energy is injected into large-scale eddies, from which it flows through the action of the non-linear term in the Navier-Stokes equation into smaller and smaller eddies until the scale of the motion is small enough that the energy can be dissipated by viscosity. In a superfluid (liquid 4He or liquid 3He), which has no viscosity, this source of dissipation is absent, so that perhaps the flow of turbulent energy persists down to atomic scales; furthermore, the absence of viscosity seems to imply that the Reynolds number is infinite. However, turbulent motion in a superfluid is restricted by quantum effects, associated with the quantization of angular momentum, and it will be shown how these effects change this picture and lead to an effectively finite Reynolds number, with dissipation that mimics the effect of viscosity and arises from the radiation of sound by special types of quantized motion