Abstract
The damping of a tightly stretched circular nickel grid vibrating at a few kHz in air, in gaseous 4He, in liquid He I and in liquid He II is investigated. With experimental error, all the data can be plotted on a universal curve of Delta omega / omega 0 rho 1 against lambda , where Delta omega and omega 0 are respectively the width and centre frequency of the resonance, rho 1 is the density of the medium and lambda is the viscous penetration depth. The nuisance damping is small. It appears feasible to develop a vibrating grid viscometer which could with advantage be applied to certain specialised situations and, in particular, to the superfluid phases of liquid 3He.
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