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Thermal conductivity of evacuated perlite at low temperatures as a function of load and load history

✍ Scribed by W.P. Dubé; L.L. Sparks; A.J. Slifka

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
434 KB
Volume
31
Category
Article
ISSN
0011-2275

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✦ Synopsis

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 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 behaviour of the conductivity was observed when perlite was subjected to cyclic mechanical loading.

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