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Effective Thermal conductivity of divided silica xerogel beds
Abstract : Apparent thermal conductivity (λ) measurements were made on monolithic silica aerogels and divided low-density xerogels. The objective of the tests on monoliths was to determine the variation of λ with the solid content. Additional compressive tests were also made to follow the evolution of bulk modulus with apparent density, in order to further optimize the solid content of xerogel particles. Divided xerogels were characterized under the following conditions: at ambient conditions (T, P, and relative humidity of water vapor in air), under partial vacuum (from atmospheric pressure to 4 × 10−7 bar) and under different relative humidities. The effect of the divided xerogel granularity on λ has been studied by using different size range and distributions. The results of our studies indicate an optimum particle density at 0.15 g cm−3, and a decrease in λ for samples containing fine particles.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00528565
Contributeur : Magalie Prudon <>
Soumis le : dimanche 18 novembre 2018 - 09:43:30
Dernière modification le : jeudi 24 septembre 2020 - 17:22:04
Archivage à long terme le : : mardi 19 février 2019 - 13:07:10
Contributeur : Magalie Prudon <>
Soumis le : dimanche 18 novembre 2018 - 09:43:30
Dernière modification le : jeudi 24 septembre 2020 - 17:22:04
Archivage à long terme le : : mardi 19 février 2019 - 13:07:10
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