An Analytical Model for Determining the Thermal Conductivity of Closed-Cell Foam Insulation
The purpose of this paper is to present analytical methods and some preliminary test results for determining the thermal conductivity and net heat flow in closed-cell foam materials used as cryogenic insulation. The treatment combines solid conduction, gas conduction, and radiation into one general mode described as the effective thermal conductivity. The temperature dependence of the thermal conductivity resulting from diffusion of atmospheric species into the insulation composite is included. The present theory stems from the development of a spray-on, closed-cell polyurethane foam material that is applied to the Saturn V second stage (S-II) as a cryogenic liquid hydrogen tank insulation. The foam replaces the original insulation, a helium-purged, honeycomb-reinforced foam composite .
KeywordsThermal Conductivity Effective Thermal Conductivity Effective Conductivity Liquid Hydrogen Foam Density
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