On Entropy Wind in Superfluid Helium

TL;DR

This paper investigates the generation of quasi-stationary flows in superfluid helium caused by intense sound waves, analyzing energy dissipation and viscosity effects, and discusses potential experimental observations.

Contribution

It provides new equations and detailed analysis of energy dissipation and viscosity effects in superfluid helium flows induced by sound waves.

Findings

Energy dissipation at shock fronts is significant.

Viscosity influences the flow dynamics.

Experimental observation estimates are provided.

Abstract

Generation of a quasi-stationary flow of the superfluid helium normal part in the presence of intense first- and second-sound waves is studied. Relevant equations are obtained. The contribution to the process of energy dissipation at the shock front layer and of fluid viscosity is analysed in detail for the case of a second-sound wave. An estimate concerning possible experimental observation of the process is made.