Skip to Main content Skip to Navigation
Journal articles

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.
Keywords : Gas Aerogels
Complete list of metadata

Cited literature [27 references]  Display  Hide  Download

https://hal-mines-paristech.archives-ouvertes.fr/hal-00528565
Contributor : Magalie Prudon <>
Submitted on : Sunday, November 18, 2018 - 9:43:30 AM
Last modification on : Tuesday, July 13, 2021 - 8:20:07 AM
Long-term archiving on: : Tuesday, February 19, 2019 - 1:07:10 PM

File

effective-thermal-conductivity...
Files produced by the author(s)

Identifiers

Citation

Antoine Bisson, Arnaud Rigacci, Didier Lecomte, Patrick Achard. Effective Thermal conductivity of divided silica xerogel beds. Journal of Non-Crystalline Solids, Elsevier, 2004, Aerogels 7. Proceedings of the 7th International Symposium on Aerogels, pp.379-384. ⟨10.1016/j.jnoncrysol.2004.08.238⟩. ⟨hal-00528565⟩

Share

Metrics

Record views

407

Files downloads

358