Superfluid avalanches

Avalanches are seen in the invasion percolation region of an adsorption/desorption isotherm for superfluid super(4)He on a Nuclepore filter. A theory of these avalanches combines elements from the geometry of the pore space of Nuclepore and elements from the dynamics of superfluid films. The geometr...

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Bibliographic Details
Published inJournal of low temperature physics Vol. 111; no. 5-6; pp. 841 - 861
Main Authors GUYER, R. A, MCCALLT, K. R
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 01.06.1998
Subjects
Acoustic wave propagation
Boson degeneracy and superfluidity of 4he
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Filters (for fluids)
Geometry
Isotherms
Mathematical models
Numerical analysis
Percolation (fluids)
Physics
Porous materials
Quantum fluids and solids; liquid and solid helium
Filling coefficient
Superfluid helium 4
Time dependence
Coordination number
Adsorption
Scaling laws
Theoretical study
Porous filter
Percolation
Desorption
Numerical method
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Summary:Avalanches are seen in the invasion percolation region of an adsorption/desorption isotherm for superfluid super(4)He on a Nuclepore filter. A theory of these avalanches combines elements from the geometry of the pore space of Nuclepore and elements from the dynamics of superfluid films. The geometry of Nuclepore filters is studied and the percolation properties of these systems are assessed. The percolation threshold is found to be characterized by the average coordination number of the pores. A model of the coupled pore space/superfluid system is introduced. This model is studied numerically and is shown to lead to self-quenched avalanches that share many qualitative properties with the avalanches seen in experiment.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2291
1573-7357
DOI:10.1023/a:1022225224418