Material

Poroelastic core

Aluminium

Al-alloys

MPP1

Air

Young’s modulus (E), [Pa]

414 × 10³

70 × 10⁹

73.1 × 10⁹

Density ( $\rho$ ) [kg/m³]

57

2700

2780

-

-

Thermal conductivity ( $k_t$ ) [W/(m.K)]

-

-

-

-

0.026

Prandt Number (Pr)

-

-

-

-

0.71

Air Density ( ${\rho }_a$ ) [kg/m³]

-

-

-

-

1.21

Ambient Pressure ( $P_0$ ) [Pa]

-

-

-

-

101,325

Dynamic viscosity ( $\eta$ ) [Pa.s]

-

-

-

-

1.81 × 10⁻⁵

Speed of sound ( $c_0$ ) [m/s]

-

-

-

-

343

Specific heat ( $c_p$ ) [J/(kg.K)]

-

-

-

-

1004

Poisson ratios ( ${\upsilon }_c$ ) [-]

0.24

0.33

-

-

-

Frame loss factor ( ${\eta }_c$ ) [-]

0.19

0.01

-

-

-

Statistic flow resistivity ( $\sigma$ ) [N.s/m⁴]

55 × 10³

4.43 × 10³

-

-

-

Specific ratio ( $\gamma$ )

-

-

-

-

1.4

Tortuosity ( ${\alpha }_{\infty }$ ) [-]

1.05

-

-

-

-

Porosity ${\epsilon }_n$ [-]

0.95

-

0.022

-

Viscous characteristic length ( $\Lambda$ ) [μm]

37

-

-

-

-

Thermal characteristic length ( ${\Lambda }^{\prime }$ ) [μm]

120

-

-

-

-

Perforations radius $a_n$ [mm]

-

-

-

0.5

-

MPP thickness $t_{pn}$ [mm]

-

-

-

1

-

Skin thickness layer h [mm]

-

-

-

0.2

-

Core/Air cavity H [mm]

-

-

-

27

-