Material

Poroelastic core

Aluminium

Al-alloys

MPP1

Air

Young’s modulus (E), [Pa]

414 × 103

70 × 109

73.1 × 109

Density ( ρ ) [kg/m3]

57

2700

2780

-

-

Thermal conductivity ( k t ) [W/(m.K)]

-

-

-

-

0.026

Prandt Number (Pr)

-

-

-

-

0.71

Air Density ( ρ a ) [kg/m3]

-

-

-

-

1.21

Ambient Pressure ( P 0 ) [Pa]

-

-

-

-

101,325

Dynamic viscosity ( η ) [Pa.s]

-

-

-

-

1.81 × 105

Speed of sound ( c 0 ) [m/s]

-

-

-

-

343

Specific heat ( c p ) [J/(kg.K)]

-

-

-

-

1004

Poisson ratios ( υ c ) [-]

0.24

0.33

-

-

-

Frame loss factor ( η c ) [-]

0.19

0.01

-

-

-

Statistic flow resistivity ( σ ) [N.s/m4]

55 × 103

4.43 × 103

-

-

-

Specific ratio ( γ )

-

-

-

-

1.4

Tortuosity ( α ) [-]

1.05

-

-

-

-

Porosity ε n [-]

0.95

-

0.022

-

Viscous characteristic length ( Λ ) [μm]

37

-

-

-

-

Thermal characteristic length ( Λ ) [μm]

120

-

-

-

-

Perforations radius a n [mm]

-

-

-

0.5

-

MPP thickness t p n [mm]

-

-

-

1

-

Skin thickness layer h [mm]

-

-

-

0.2

-

Core/Air cavity H [mm]

-

-

-

27

-