Film Transfer in Helium II: I - The Thermo-Mechanical Effect

The existence of a thermo-mechanical pressure difference has been established with the transfer film instead of a capillary connecting the two volumes of liquid helium II. It is shown that under these circumstances reversible conditions are closely approximated since return flow of heat or liquid through the film is negligible. The speed with which a thermo-mechanical pressure difference can be established is limited by the same critical transfer rate as that determining film transport under gravitation.