부산대학교 도서관

The response of the superfluid film velocityv to varying driving force is measured from 1 to 2.12 K using gravitational film flow between bulk reservoirs. Data on the reservoir level vs. time are analyzed and compared with four intrinsic dissipation models and can be best fit, to within 0.5%, by the formdv/dt?-?(T) exp [-vb(T)/v], where ?(T) andvb(T) are phenomenological parameters. Previous intrinsic dissipation measurements are critically reviewed. New indirect evidence for kinetic thinning of the film is found in 0.5% distortions in the thermally damped oscillations of the reservoir levels. Topics in potential flow damping are discussed.