Polarization of superfluid turbulence

TL;DR

This paper demonstrates that normal fluid eddies in turbulent helium II induce polarization in the superfluid vortex tangle, creating vorticity patterns that mirror the normal fluid flow, explaining classical-superfluid turbulence similarities.

Contribution

It reveals the polarization mechanism of superfluid vortices by normal fluid eddies across the inertial range, linking classical and superfluid turbulence behaviors.

Findings

Normal fluid eddies polarize superfluid vortex lines.

Polarization occurs over the entire inertial range.

Explains observed analogies between classical and superfluid turbulence.

Abstract

We show that normal fluid eddies in turbulent helium II polarize the tangle of quantized vortex lines present in the flow, thus inducing superfluid vorticity patterns similar to the driving normal fluid eddies. We also show that the polarization is effective over the entire inertial range. The results help explain the surprising analogies between classical and superfluid turbulence which have been observed recently.