Print Email Facebook Twitter A theoretical investigation of gas conduction effects on multilayer insulation performance Title A theoretical investigation of gas conduction effects on multilayer insulation performance Author Delil, A.A.M. Heemskerk, J.F. Institution National Aerospace Laboratory NLR Date 1976-02-09 Abstract The thermal performance of multilayer insulation hlankets depends on three (interacting) modes of energy transfer: radiation between the radiation shields, gas conduction in the residual interstitial gas and solid conduction via the contacting interfaces. The contribution of the gas conduction depends on the interstitial gas and its pressure, that are determined mainly by the temperature dependent outgassing of the shield and spacer materials. Special attention has been given to the actual problems of the insulation of the storage of cryogenic licpiids in vessels, the insulation of black boxes from space environment and the effect of gas sources surroimded by multilayer insulation. The results indicate that perforation of the shields reduces the insulation properties of a blanket considerably. Hence for cryogenic storage non-perforated shields are to be preferred. In space cutted shields are to be preferred, because they allow fast depressurisation without impairing the radiation properties. Subject heat transfermultilayer insulationspacecraft shieldingheat transfer coefficientsmathematical modelsthermal conductivitygaseous diffusionthermal diffusionthermal insulationcryogenic fluid storageoutgassing To reference this document use: http://resolver.tudelft.nl/uuid:0df4af9d-a7b2-4768-a0f6-a98e8a8c7e7e Publisher Nationaal Lucht- en Ruimtevaartlaboratorium Access restriction Campus only Source NLR-TR 76018 U Part of collection Aerospace Engineering Reports Document type report Rights (c) 1976 National Aerospace Laboratory NLR Files campus only