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A platform for research: civil engineering, architecture and urbanism
Fiber’s hygromorphic effect on thermal conductivity of wooden fibrous insulation characterized by X-ray tomography
Highlights3D X-ray tomography reconstructions are performed at various relative humidity.Fibers’ distribution and orientation function of the hygroscopicity are described.The hygromorphic behavior of isolated fibers is finely examined.3D anisotropic equivalent thermal conductivities are simulated.The sensitivity of the hygric state is considered in the thermal study.
AbstractFibrous-woods have very complex morphology and high heterogeneity, hence their properties are not well-known and need to be investigated, especially concerning microstructural changes due to hygro-thermal loads. The present, experimental and numerical work studies the microstructural hygro-thermal behavior of such material. The experimental procedure was performed on the microstructure level using the non-destructive method; X-ray tomography through a specifically developed processing protocol. The reconstructed volumes have a fine resolution of 7µm/voxel. The volumetric analysis illustrated a representative elementary volume of 57mm3. The geometrical microstructure properties (porosity, fiber diameter and pore, fiber orientation, etc.) were extracted from the 3D image analysis. Moreover, a successive X-ray scans of the same fibrous specimen solicited at different relative humidity levels were achieved. The evolution of both the average and the local fibers’ diameters distribution properties as a function of the water content were examined. The material’s porosity and its fibers’ thicknesses show an explicit correlation with the water content. Also, heat transfer simulation of the 3D real insulation structure was evaluated using the energy balance equation. The effective thermal conductivity is computed as a function of the relative humidity. Interlink between the porosity and the thermal conductivity was established too. The results provide enhance our understand of the wood fiber insulation’s behavior.
Fiber’s hygromorphic effect on thermal conductivity of wooden fibrous insulation characterized by X-ray tomography
Highlights3D X-ray tomography reconstructions are performed at various relative humidity.Fibers’ distribution and orientation function of the hygroscopicity are described.The hygromorphic behavior of isolated fibers is finely examined.3D anisotropic equivalent thermal conductivities are simulated.The sensitivity of the hygric state is considered in the thermal study.
AbstractFibrous-woods have very complex morphology and high heterogeneity, hence their properties are not well-known and need to be investigated, especially concerning microstructural changes due to hygro-thermal loads. The present, experimental and numerical work studies the microstructural hygro-thermal behavior of such material. The experimental procedure was performed on the microstructure level using the non-destructive method; X-ray tomography through a specifically developed processing protocol. The reconstructed volumes have a fine resolution of 7µm/voxel. The volumetric analysis illustrated a representative elementary volume of 57mm3. The geometrical microstructure properties (porosity, fiber diameter and pore, fiber orientation, etc.) were extracted from the 3D image analysis. Moreover, a successive X-ray scans of the same fibrous specimen solicited at different relative humidity levels were achieved. The evolution of both the average and the local fibers’ diameters distribution properties as a function of the water content were examined. The material’s porosity and its fibers’ thicknesses show an explicit correlation with the water content. Also, heat transfer simulation of the 3D real insulation structure was evaluated using the energy balance equation. The effective thermal conductivity is computed as a function of the relative humidity. Interlink between the porosity and the thermal conductivity was established too. The results provide enhance our understand of the wood fiber insulation’s behavior.
Fiber’s hygromorphic effect on thermal conductivity of wooden fibrous insulation characterized by X-ray tomography
El Hachem, Chady (author) / Ye, Pan (author) / Abahri, Kamilia (author) / Bennacer, Rachid (author)
Construction and Building Materials ; 150 ; 758-765
2017-06-02
8 pages
Article (Journal)
Electronic Resource
English
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