Prediction of the six parameters of an equivalent fluid model for thermocompressed glass wools and melamine foam

Micro-Macro Modelling Approach of Vegetal Wools Thermal Conductivity

“…We consider, as a first approximation, that the solid phase of vegetal wools is made of successive horizontal and parallel fibre layers due to their manufacturing process. It gives them an anisotropic behavior (Lei et al, 2018). We also consider that fibres have a constant cross-section over their entire length.…”

A self-consistent approach for the acoustical modeling of vegetal wools

“…However, the parallel case does not correspond to a conventional use of insulation panels in buildings. Even though all orientations of the wave are possible between these two limits [9,29], in this paper, only a specific focus is done on the perpendicular case which corresponds to most practical applications. To use a micro-macro homogenization method, 125 two basic principles must be respected :…”

“…They display a strong variability in fibre size distribution [5,8]. Moreover, the organization of fibres in the materials leads to an anisotropic behaviour [9,10]. These aspects of the fibrous microstructure of vegetal 10 wools have a direct impact on their sound absorption performances at macroscopic scale [5,8,11,12,13] and it is necessary to take them into account when modeling sound absorption coefficient of vegetal wools.…”

Improving the sound absorption performance of sustainable thermal insulation materials: Natural hemp fibres

“…However, it should be mentioned that the linear relationships, developed for 1D compression, have been validated only for a material with high internal porosity within the range φ = 0.944 ÷ 0.995. In fact, it has been shown [42,43] that Castagnède et al's formulas for 1D compression provide reliable results when a small compression rate and highly porous materials are considered, although it may be inaccurate to investigate high density materials. Moreover, this approach does not take into account the variation of the fibres' orientation due to the compression, which has been proven to have a significant influence on the physical properties of the material [43].…”

“…In fact, it has been shown [42,43] that Castagnède et al's formulas for 1D compression provide reliable results when a small compression rate and highly porous materials are considered, although it may be inaccurate to investigate high density materials. Moreover, this approach does not take into account the variation of the fibres' orientation due to the compression, which has been proven to have a significant influence on the physical properties of the material [43]. Nevertheless, Castagnède's model, due to its simplicity and straightforward applicability, represents a good starting point to define an empirical tool to be used in order to characterise hemp fibres, which have never been systematically…”