Waves propagation in turbulent superfluid helium in presence of combined rotation and counterflow

TL;DR

This paper investigates how various waves propagate in turbulent superfluid helium under rotation, counterflow, and combined conditions, aiming to infer vortex tangle characteristics from wave behavior.

Contribution

It provides a comprehensive analysis of wave propagation in turbulent superfluid helium under multiple conditions, linking wave properties to vortex tangle features.

Findings

Wave speed and attenuation depend on propagation direction relative to rotation.

Different wave types exhibit distinct behaviors in turbulent conditions.

Analysis offers insights into vortex tangle structure from wave measurements.

Abstract

A complete study of the propagation of waves (namely longitudinal density and temperature waves, longitudinal and transversal velocity waves and heat waves) in turbulent superfluid helium is made in three situations: a rotating frame, a thermal counterflow, and the simultaneous combination of thermal counterflow and rotation. Our analysis aims to obtain as much as possible information on the tangle of quantized vortices from the wave speed and attenuation factor of these different waves, depending on their relative direction of propagation with respect to the rotation vector.