Excitation and Relaxation of Film Flow Induced by Third Sound

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High amplitude third sound waves are observed to create and to destroy persistent flow states within a circular resonator. These changes are necessarily a result modifying the underlying distribution of pinned vortices responsible for the flow. At low temperatures, large oscillatory flows associated with the third sound wave agitation are required to both increase and decrease the flow. At higher temperatures, thermally assisted de-pinning enhances the destructive aspects of lower amplitude third sound agitation. The constructive, or swirling tendency of the third sound agitation is also enhanced, but only in the presence of the wave excitation. At the higher temperatures, the ability of the induced flow to be trapped as a persistent current is diminished.

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