Fluidization of granular media wetted by liquid 4He.

Journal Article (Journal Article)

We explore experimentally the fluidization of vertically agitated polymethylmethacrylate spheres wetted by liquid 4He . By controlling the temperature around the lambda point, we change the properties of the wetting liquid from a normal fluid (helium I) to a superfluid (helium II). For wetting by helium I, the critical acceleration for fluidization (Gamma_{c}) shows a steep increase close to the saturation of the vapor pressure in the sample cell. For helium II wetting, Gamma_{c} starts to increase at about 75% saturation, indicating that capillary bridges are enhanced by the superflow of the unsaturated helium film. Above saturation, Gamma_{c} enters a plateau regime where the capillary force between particles is independent of the bridge volume. The plateau value is found to vary with temperature and shows a peak at 2.1K , which we attribute to the influence of the specific heat of liquid helium.

Full Text

Duke Authors

Cited Authors

  • Huang, K; Sohaili, M; Schröter, M; Herminghaus, S

Published Date

  • January 27, 2009

Published In

Volume / Issue

  • 79 / 1 Pt 1

Start / End Page

  • 010301 -

PubMed ID

  • 19256990

Electronic International Standard Serial Number (EISSN)

  • 1550-2376

International Standard Serial Number (ISSN)

  • 1539-3755

Digital Object Identifier (DOI)

  • 10.1103/physreve.79.010301

Language

  • eng