Waves in superfluid helium

A brief introduction to the basic hydrodynamic and thermodynamic properties and to quantum vortices is given. The two fluid flow equations are introduced. The second sound, temperature waves are considered, their specific properties and structure analysed. A brief account of third sound capillary and thin film waves as well as fourth sound waves is scetched. A geometrical treatment of the evolution of axisymmetric heat pulses is presented. The large influence of quantum turbulence on the evolution of second sound waves is illustrated analysing the evolution of moderate second sound heat pulses.