Coefficients of the Second Viscosity in Thin Liquid-Helium Films
Abstract
The coefficients of the second viscosity in thin liquid-helium films are evaluated explicitly as a function of temperature (T) via interactions between elementary excitations which include the anomalous excitation spectrum. For T > or = 0.3 K the coefficients behave like those of the bulk liquid helium, while for T < or = 0.3 K the temperature variations of four coefficients of the second viscosity show a T-1-dependence, which is due to the three-phonon processes (3PP) originating from the anomalous excitation spectrum of two- dimensional liquid helium at low momenta and low temperatures. The 1/T- dependence also appears in the first viscosity of bulk and thin liquid helium, which is based on the 3PP. Keywords: Coefficients, Temperature, Three-phonon processes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA225237
Entities
People
- Chul-won Jun
- Chung-in Um
- Thomas F. George
Organizations
- University at Buffalo