Flow of turbulent superfluid helium inside a porous medium

In the work a macroscopic model of inhomogeneous superfluidturbulence previously formulated is further developed toinvestigate the flow of superfluid helium inside a very thincapillary or a porous medium. A boundary condition is formulated,which is able to explain the reversible flow of helium inside thecapillary. Using this condition the propagation of harmonic wavesinside a porous medium is studied. It is shown that the modelallows the propagation of a wave in which in addition to thehydrodynamical fields (density and velocity) also the temperature,the heat flux and the vortex line density vibrate.