Solid Conductivity of Loaded Fibrous Insulations
Abstract
The thermal conductivity and the elasto-mechanical behavior of a fibrous glass paper insulation and of a fibrous alumina fleece were investigated as a function of external pressure load. The main findings are: (1) at an external load Pext = 1 bar the solid thermal conductivity λs of the glass fiber paper is about 1.5 ∙ 10-3 W/(m ∙ K) and for the fleece is 3 ∙ 10-3 W/(m ∙ K); and (2) the variation of λs with Pext is weak for the paper and pronounced for the fleece. Three models were employed to study the correlation between λs and the elasto-mechanical behavior: Kaganer's model, percolation theory, and the phonon diffusion model.
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A detailed model which considers the impact of material porosity, external pressure on the fiber layer, and fiber elasticity was examined [38,48] and leads to an expression for effective conductivity.
“A detailed model which considers the impact of material porosity ∅ , external pressure on the fiber layer Pext and fiber elasticity E was examined [38,48] and leads to the expression:”
From Effective thermal conductivity of insulation materials for cryogenic LH2 storage tanks: A review (2023) · cites this paper as [38]
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Effective thermal conductivity of insulation materials for cryogenic LH2 storage tanks: A review
Ratnakar, R. R., Sun, Z., & Balakotaiah, V. (2023) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2022.11.130 · Cited by 73 · see citing works
- Authors
- Fricke, J., Büttner, D., Caps, R., Gross, J., & Nilsson, O.
- Affiliations
- University of Würzburg (DE)
- ORCID
- Venue
- Insulation Materials, Testing and Applications
- Published
- 1990-01-01
- Pages
- 66-78
- OpenAlex
- W2169157639
- Cited by
- 15
- References
- 0
- Citations by year
- 2025: 1 · 2022: 1 · 2020: 1 · 2019: 1 · 2016: 1 · 2015: 1 · 2012: 2
- FWCI
- 1.90
- Type
- book chapter
- Language
- en
- Open access
- closed
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Engineering › Computational Mechanics › Heat and Mass Transfer in Porous Media
- Physical Sciences › Materials Science › Materials Chemistry › High voltage insulation and dielectric phenomena
- Keywords
- solid thermal conductivity, fibrous insulation, percolation theory, thermal insulation
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