Surface tension sound in superfluid helium films adsorbed on alumina powder

✍ Scribed by R. Rosenbaum; G. A. Williams; D. Heckerman; J. Marcus; D. Scholler; J. Maynard; I. Rudnick

• Publisher: Springer US
• Year: 1979
• Tongue: English
• Weight: 796 KB
• Volume: 37
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00113877

✦ Synopsis

Sound propagation has been studied in He H films adsorbed on alumina powder grains (Ale03). Sound velocity and adsorption isotherm data provide evidence that surface tension forces can exceed the van der Waals forces as the film thickness increases. A model of capillary condensation at the points where

the powder grains touch accounts for many of the qualitative features of the data. The surface tension sound velocity decreases with increasing powder grain size.