EXPERIMENTAL STUDY OF THE LAMBDA TRANSITION OF LIQUID HELIUM USING FIRST SOUND ATTENUATION.

Abstract

The attenuation of first sound near the lambda point can be interpreted as being due to two phenomena: (1) a relaxation process described by Pokrovskii and Khalatnikov occurring only below the lambda point, and having a relaxation time of XiC2 where C2 is the velocity of second sound and Xi is a coherence length of magnitude 1.36 x 10 to the minus 8th power ((T sub Lambda)-T) to the minus 2/3 power cm; (2) a critical attenuation which is non-singular and symmetrical about T sub Lambda. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1970
Accession Number
AD0713478

Entities

People

  • Richard D. Williams

Organizations

  • University of California, Los Angeles

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Attenuation
  • Losses
  • Motion
  • Physical Properties
  • Relaxation Time
  • Transitions

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Analytical Mechanics
  • Combustion Dynamics and Shock Wave Physics.