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THERMAL CONDUCTIVITY OF EVACUATED PERLITE AT LOW TEMPERATURES AS A FUNCTION OF LOAD AND LOAD HISTORY.

Author(s) : DUBE W. P., SPARKS L. L., SLIFKA A. J.

Type of article: Article

Summary

PERLITE, A POWDERED INSULATION, IS COMMONLY USED IN LARGE CRYOGENIC STORAGE DEWARS. WHEN THESE DEWARS ARE THERMALLY CYCLED, THE PERLITE IN THE EVACUATED SPACE BETWEEN THE INNER AND OUTER VESSELS OF THE DEWAR EXPERIENCED A CHANGING MECHANICAL LOAD DUE TO THERMAL EXPANSION AND CONTRACTION OF THE INNER VESSEL. THE APPARENT THERMAL CONDUCTIVITY OF EVACUATED PERLITE INCREASES STRONGLY WITH APPLIED LOAD. HYSTERETIC BEHAVIOUR OF THE CONDUCTIVITY WAS OBSERVED WHEN PERLITE WAS SUBJECTED TO CYCLIC MECHANICAL LOADING.

Details

  • Original title: THERMAL CONDUCTIVITY OF EVACUATED PERLITE AT LOW TEMPERATURES AS A FUNCTION OF LOAD AND LOAD HISTORY.
  • Record ID : 1992-0027
  • Languages: English
  • Source: Cryogenics - vol. 31 - n. 1
  • Publication date: 1991/01

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