Calculation of Gaseous Heat Conduction in Dewars
The use of high vacuum as an element of thermal insulation is familiar through the example of the cryogenic vessel. In such devices it is not always practical to achieve such a high vacuum as to make the gaseous conduction of heat negligible compared to radiation. Indeed, when both boundaries are at a low temperature—as in a vessel for liquid hydrogen or helium when surrounded by liquid nitrogen or liquid air—the gaseous conduction may predominate. Consequently the calculation of such conduction is a necessary part of the engineering design of vacuum insulations.
KeywordsSilica Aerogel Thermal Conductivity Coefficient Accommodation Coefficient Specific Heat Ratio Vacuum Insulation
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