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Thermal conductivity of evacuated perlite at low temperatures as a function of load and load historyPerlite, 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 experiences a changing mechanical load due to thermal expansion and contraction of the inner vessel. Thermal conductivity data were obtained using a boil-off calorimeter. The apparent thermal conductivity of evacuated perlite increases strongly with applied load. Hysteretic behavior of the conductivity was observed when perlite was subjected to cyclic mechanical loading.
Document ID
19910038948
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dube, W. P.
(National Inst. of Standards and Technology Boulder, CO, United States)
Sparks, L. L.
(National Inst. of Standards and Technology Boulder, CO, United States)
Slifka, A. J.
(NIST, Center for Chemical Technology, Boulder CO, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Cryogenics
Volume: 31
ISSN: 0011-2275
Subject Category
Nonmetallic Materials
Accession Number
91A23571
Distribution Limits
Public
Copyright
Other

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