Gaseous Conductivity Study on Silica Aerogel and Its Composite Insulation Materials
Abstract
This paper presents a theoretical and experimental study on gaseous conductivity of silica aerogel and composite insulation materials. First, the insulation material samples (including silica aerogel, xonotlite-type calcium silicate, xonotlite-aerogel composite, and ceramic fiber-aerogel composite) were prepared. Next, the gaseous conductivities of the prepared samples were measured from 0.045 Pa to atmospheric pressure using the transient hot-strip (THS) method. The gaseous conductivity expressions obtained based on the kinetic theory were then compared with the experimental results. It is shown that the gaseous conductivity of both xonotlite-type calcium silicate and silica aerogel decreases significantly with decreasing pressure. The gaseous conductivities of xonotlite-type calcium silicate and silica aerogel reach zero at about 100 Pa and 104 Pa, respectively. The theoretical gaseous conductivity expressions match well with the experimental results of xonotlite-type calcium silicate and silica aerogel but not with the experimental results for the composite insulation materials. This mismatch indicates that the aerogel does not totally fill the original interspace of the xonotlite-type calcium silicate and ceramic fiber in the two kinds of composite insulation materials.
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The soft vacuum region, from about 0.1 torr to 10 torr, is complex and difficult to model because all modes of heat transfer-solid conduction, radiation, gas conduction, and convection-can be significant contributors to the total heat flow.
“The soft vacuum region, from about 0.1 torr to 10 torr, is complex and difficult to model because all modes of heat transfer -solid conduction, radiation, gas conduction, and convection -are significant contributors to the total heat flow.”
From Thermal conductivity of aerogel blanket insulation under cryogenic-vacuum conditions in different gas environments (2017) · cites this paper as [4]
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Fesmire, J. E., Ancipink, J. B., Swanger, A. M., White, S., & Yarbrough, D. (2017) · IOP Conference Series: Materials Science and Engineering · doi:10.1088/1757-899x/278/1/012198 · Cited by 18 · see citing works
- Authors
- Wei, G., Liu, Y., Du, X., & Zhang, X.
- Affiliations
- North China Electric Power University (CN)
- Energy Department of Beijing Sustainable Development Centre, Beijing 100083, China
- University of Science and Technology Beijing (CN)
- Venue
- Journal of Heat Transfer
- Publisher
- Wiley
- Published
- 2012-02-13
- Volume
- 134
- Issue
- 4
- ISSN
- 0022-1481 (ISSN-L)
- 1528-8943
- OpenAlex
- W2130927046
- Cited by
- 26
- References
- 0
- Citations by year
- 2026: 2 · 2024: 2 · 2022: 4 · 2021: 2 · 2019: 1 · 2018: 3 · 2017: 3 · 2016: 1 · 2015: 3 · 2014: 1 · 2013: 2 · 2012: 2
- FWCI
- 1.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ASME Journal of Heat and Mass Transfer (publishedVersion)
- Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities
- Topics
- Physical Sciences › Chemistry › Spectroscopy › Aerogels and thermal insulation
- Physical Sciences › Engineering › Computational Mechanics › Heat and Mass Transfer in Porous Media
- Physical Sciences › Mathematics › Applied Mathematics › Gas Dynamics and Kinetic Theory
- Keywords
- silica aerogel, composite insulation materials, kinetic theory of gases
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