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Table 1

Properties of media used in simulated tests, taken from the literature and especially [1, 11, 13].

Property (unit) Foam 1 Foam 2 Non-woven film Woven film
Open-porosity ϕ 0.994 0.99 0.72 0.04
Airflow resistivity σ (N s m−4) 9045 65000 87 × 103 775 × 103
Tortuosity α 1.02 1.98 1.02 1.15
Thermal CL Λ′ (μm) 197 120 480 230
Viscous CL Λ (μm) 103 37 480 230
Density ρ 1 (kg m−3) 8.43 16 171 809
Poisson ratio ν 0.42 0.3 0 0.3
Young’s modulus E (Pa) 194.9 × 103 46.8 × 106 50 × 103 260 × 106
Loss factor η 0.05 0.1 0.5 0.5

CL stands for characteristic length.

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