Effect of vibrations on microaperture flow experiments in superfluid helium

It is shown in a simple model that low frequency mechanical vibrations of the experimental apparatus can have astrong effect on the superfluid flow in a microaperture between two volumes of superfluid helium. For superfluid ³He flowing through a submicron aperture one can easily get a random flow velocity of the order of the critical velocity. Conclusions are made on how to avoid this effect by the proper design of the experimental cell.