Thermal diffusivity of materials generally increases with decrease of density. In case of porous materials, normally density decreases as the volume fraction of pores increases, however thermal diffusivity also decreases with increase of pore fractions ( due to includion of air and variation in mean free path for phonos in case of ceramics).
Keeping above in view, what are suggestions about using desnsity value of porous materials? Should we use experimental (bulk) density or theoratical/real density of material?
Example: if the real density of a materials (without pores) is 3 g/cm3 and its bulk density (with pores) is 2 g/cm3, what density value should be used for calculations, 2 or 3 g/cm3?
Please advise.
Thanks
In thermal simulations or analyses of porous materials, you should typically use the actual material density rather than the bulk density. The actual material density takes into account the porosity of the material, which is crucial for accurately modeling heat transfer and other thermal properties within the porous structure. Bulk density includes the void spaces within the material, which can significantly affect heat conduction and storage characteristics. Using the actual material density will provide more accurate results in your thermal simulations for porous materials.
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