Abstract
He II periodic boundary layer experiments on the damping of torsional oscillations of a sphere have been re-analyzed based on recent classical stability theory. We have verified this theory using a torsionally oscillating sphere and an electrochemical visualization scheme in water. We show that macroscopic He II periodic boundary layer flows exhibit instabilities that are described by classical stability criteria if the kinematic viscosity is regarded as the dynamic viscosity over the total fluid density.
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