Table 2.

Parameters of airflow

Symbol	Parameter	Value	Units	Reference
${\rho }^a,{\rho }^{\widehat{a}}$	Density of air	1.225	$\text{kg}{\text{m}}^{-3}$	Known
${\mu }^a,{\mu }^{\widehat{a}}$	Dynamic viscosity of air	$1.5\times {10}^{-5}$	$\text{kg}{\text{m}}^{-1}{\text{s}}^{-1}$	Known
$k^a$	Permeability of air	$1.2\times {10}^{-9}$	${\text{m}}^2$	Degroot and Straatman (2012)