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CRITICAL TRANSPORT PARAMETERS FOR POROUS MEDIA SUBJECTED TO COUNTERFLOW.

Author(s) : FREDERKING T. H. K., AFIFI F. A., ONO D. Y.

Type of article: Article

Summary

EXPERIMENTAL AND THEORETICAL STUDIES HAVE BEEN CONDUCTED TO DETERMINE CRITICAL PARAMETERS AT THE ONSET OF NON-LINEAR COUNTERFLOW IN HELIUM II BELOW THE LAMBDA POINT OF HELIUM 4. CRITICAL TEMPERATURE DIFFERENCES HAVE BEEN MEASURED IN POROUS MEDIA FOR ZERO NET MASS FLOW AND FOR DARCY PERMEABILITIES IN THE ORDER OF MAGNITUDE RANGE FROM 10.E-10 TO 10.E-8 CM2. THE NORMALIZED CRITICAL TEMPERATURE GRADIENTS, WHICH COVERED THE LIQUID TEMPERATURE RANGE OF 1.5 K TO THE LAMBDA TEMPERATURE, ARE FOUND TO VARY WITH T PROPORTIONAL TO THE RATIO OF THE SUPERFLUID DENSITY TO THE NORMAL FLUID DENSITY.

Details

  • Original title: CRITICAL TRANSPORT PARAMETERS FOR POROUS MEDIA SUBJECTED TO COUNTERFLOW.
  • Record ID : 1991-1915
  • Languages: English
  • Source: Cryogenics - vol. 29 - n. 5
  • Publication date: 1989

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