Published: Jan 1978
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Test results are presented for the thermal conductivity, over a broad range of temperatures and pressures, of two refractory blown fiber insulations. The data, which were obtained for several bulk densities of each material, are compared with predictions from a theoretical expression that accounts for radiation transmission as well as solid and gas conduction contributions to the effective conductivity. The simple model utilized provides a remarkably accurate prediction of insulation performance for the materials of interest and, therefore, represents a useful tool for design purposes, minimizing the amount of actual testing necessary to characterize candidate materials. Criteria are indicated by which it is possible to determine whether the model will be applicable to a given fiber insulation. This study was accomplished over a two and one-half year period, in support of the Space Shuttle thermal protection system design.
fibrous insulation, thermal insulation, heat transmission, thermal conductivity, guarded hot plate, infrared transmission, high-temperature tests
Member of technical staff, Rockwell International, Space Division, Downey, Calif.