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Table 2
Material properties from the characterisation process as a first step to the experimental validation (see Sect. 4).
| Property (unit) | Melamine | Glass wool | Non-woven Film | Woven film |
|---|---|---|---|---|
| Open-porosity ϕ | 0.99 | 0.97 | 0.096 ± 0.01 | 0.022 ± 0.003 |
| Airflow resistivity σ (N s m−4) | 11400 ± 300 | 76100 ± 4400 | (7189 ± 1043) × 102 | (55799 ± 8305) × 102 |
| Tortuosity α ∞ | 1.03 ± 0.02 | 1.5 ± 0.55 | 1.07 ± 0.01 | 1.13 ± 0.01 |
| Thermal CL Λ′ (μm) | 155 ± 66 | 64 ± 30 | 46 ± 3 | 35 ± 3 |
| Viscous CL Λ (μm) | 91 ± 18 | 30 ± 17 | 46 ± 3 | 35 ± 3 |
| Density ρ 1 (kg m−3) | 9.2 ± 0.4 | 94.1 ± 2.7 | 427 ± 14 | 1243.5 ± 27.3 |
| Thickness d (mm) | 24.2 ± 0.3 | 48.9 ±  0.1 |
0.59 ± 0.01 | 0.369 |
CL stands for characteristic length.
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