Surface tension sound in superfluid helium films adsorbed on alumina powder

R. Rosenbaum*, G. A. Williams, D. Heckerman, J. Marcus, D. Scholler, J. Maynard, I. Rudnick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Sound propagation has been studied in He II films adsorbed on alumina powder grains (Al2O3). Sound velocity and adsorption isotherm data provide evidence that surf ace 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.

Original languageEnglish
Pages (from-to)663-678
Number of pages16
JournalJournal of Low Temperature Physics
Volume37
Issue number5-6
DOIs
StatePublished - Dec 1979
Externally publishedYes

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