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- W79220301 abstract "Models describing the thermal performance of evacuated multilayer insulation blankets are usually^ based on the simple addition of the three mutually interacting modes of energy transfer: radiation between the shields, solid conduction via the components and their interfaces and gas conduction in the interstices, determined by residual gas pressure, outgas and the way the outgas products migrate through the blanket. Blankets for spacecraft applications are usually made of perforated shields allowing fast depressurization during the launch of the spacecraft. Perforations impair the insulation quality of a blanket, because the perforation holes increase the effective shield emissivity (hence the radiation transfer) and the holes allow for broadside pumping viz. the outgas products migrate via the holes, from interstice to interstice gradually accumulating until they eventually escape at the blanket boundary. Reported models concern either purely broadside pumped blankets or purely edge pumped blankets (of non-perforated shields, where the outgas products can escape only at the edges of the interstices). The pumping in most blankets for spacecraft is simultaneously edge and broadside. This paper presents the model developed to account for this hybrid pumping action. Experiments have been carried out on several blanket samples using a guarded hot plate calorimeter placed in a vacuum chamber. Results are presented to illustrate the good agreement between theory and experiment." @default.
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- W79220301 date "1981-09-02" @default.
- W79220301 modified "2023-09-27" @default.
- W79220301 title "Multilayer insulation blankets for spacecraft applications: thermal model accounting for outgassing and different ways of gas migration" @default.
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