Table 3 Physical parameters and their values

From: Simultaneous acoustic perfect absorption and rainbow trapping via topologically optimized sub-wavelength multi-slit sonic crystal metamaterials

Physical Parameters

Values [unit]

Sound speed in air (\(c\))

\(343\,[m/s]\)

Density of air (\(\rho\))

\(1.204\,[{kg}/{m}^{3}]\)

Dynamic viscosity of air (\(\eta\))

\(1.825\,{\rm{x}}\,{10}^{-5}\,\left[{Pa}\cdot s\right]\)

Specific heat ratio of air (\(\gamma\))

\(1.4\)

Prandtl number of air (\(\Pr\))

\(7.309\,{\rm{x}}\,{10}^{-1}\)

Thermal conductivity of air (\({k}_{{th}}\))

\(2.514\,{\rm{x}}\,{10}^{-2}\,[W/(m\cdot K)]\)

Heat capacity at constant pressure (\({C}_{p}\))

\(1.007\,{\rm{x}}\,{10}^{3}\)[\(J/({kg}\cdot K)\)]

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