THERMAL-RESISTANCE OF A VAPOR-LIQUID HE(II) INTERFACE

Vapor-liquid He II interface subjected to heat flux has a specific par ticularity. The variations of the superfluid component density, rho(s) , in the vicinity of the interface induce a boundary layer in the liqu id side which acts as an additional thermal resistance, Ri. The variat ions of rho(s) in that boundary layer depend on the temperature distan ce apart from T(lambda) and thus one looks for two analytical expressi ons for Ri, the first near of T(lambda) by using the general parameter order theory of Ginzburg-Pitaevskii, and the second far from the lamb da point by using the Gorter and Kronig prediction. Numerical comparis on of the above predictions with the experimental data, obtained by tw o different methods, shows an acceptable agreement.