Abstract
A dense fog consisting of superfluid 4 He droplets can be generated in helium vapor up -to a height of a few cm from the helium surface by driving a piezo transducer plate immersed under the liquid. The average droplet size is measured with a long-distance microscope and CCD camera, and ranges from about 100 μm at a drive frequency of 1 kHz to 10 μm at 100 kHz. The dependence of the droplet size on frequency is quite consistent with the capillary-wave dispersion relation of the helium surface, with the droplets ejected from the surface being about one wavelength in diameter. The initial vertical velocity of the droplets emerging from the surface is found to increase linearly with the driving voltage being applied to the piezo.
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