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- W87124629 abstract "Numerical simulations of the radial heat flow apparatus used to measure the apparent thermal conductivity (k/sub a/) of powders with high thermal resistance (R) showed that heat losses from the ends of the cylindrical specimen and core heater cause the k/sub a/ of the specimen to be greater than the true value. This effect is large when high-R powders are tested. A radial apparatus 91 cm in length, ORNL-5, was constructed and used to reduce uncertainties introduced by end losses. ORNL-5 was used to test mixtures of low-cost coarse fumed-silica particles and relatively uniform, but expensive, fine fumed-silica particles. R-values per inch (2.54 cm) in air near 7 have been measured for pure fumed-silica powders. The thermal resistances of mixtures of coarse and fine powders were determined in the range 290 to 340/sup 0/K at atmospheric pressure. Results show that R per inch depends on density and that R-values per inch greater than 5 can be achieved with such mixtures. R-values for a mixture of nominal 7-nm fine silica and coarse silica have been measured as a function of pressure near 300/sup 0/K, and R per inch greater than 40 has been achieved in vacuum (<10 Pa). Linear heat flowmore » measurements on evacuated rectangular panels showed that R per inch for the panels dropped from 16.8 to 15.9 in two years.« less" @default.
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- W87124629 date "1986-05-01" @default.
- W87124629 modified "2023-09-27" @default.
- W87124629 title "Development of advanced thermal insulation for appliances. Progress report, July 1984-June 1985" @default.
- W87124629 hasPublicationYear "1986" @default.
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