Helium II Film Transport. IV. The Role of Temperature

The study of film transport, inaugurated in previous papers in this series, is concluded with a statistical analysis of the temperature dependence of the transport rates, with particular attention to the possibility of detecting systematic variations with substrate, surface finish, and film height. Analysis of 153 rate vs temperature characteristic curves reveals that the temperature dependence of the transport is relatively insensitive to changes in the aforementioned parameters. The functional dependence of the normalized, average transport rates for all materials, finishes, and film heights discussed in papers I-III, is given by [$1-{\left(\frac{T}{T_{\lambda }}\right)}^7$], in the temperature range under investigation ($1.1°\mathrm{K}<~T<\mathrm{}{T}_{\lambda }$). These results are compared with various theoretical predictions based on the two-fluid model of liquid helium as well as with relevant reports of other observers.