Dissipation and oscillations in the flow of the saturated He II film

1573-7357

Springer Online Journal Archives 1860-2000

Physics

Abstract 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∝−ν(T) exp [−v b (T)/v], where ν(T) andv b (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.

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