DISSIPATIVE TERMS OF THERMAL NATURE IN THE THEORY OF AN IDEAL MONOATOMIC SUPERFLUID

A dissipative model of helium II was built up in previous works. using a 13-field extended thermodynamic theory formulated by Liu and Muller . In this work a generalization of such model is presented, where an e xtended thermodynamics with 14 fields due to Kremer is used. It is sho wn that the fourteenth field is able to account for the experimental d ata concerning the second sound attenuation. Further, the proposed the ory is able to explain the Osborne experiment Finally, a comparison wi th the two-fluid model is pel formed, emphasizing the different ways i n which the dissipative phenomena are explained by the two theories.