Convection thermal resistance between air and inner wall of the tunnel.

Symbol
$T_{\mathrm{at}}$
Unit
K.m/W
Formulae
$\frac{43.4782608695652}{\mathrm{Pr}_{\mathrm{air}}^{0.4} \mathrm{Re}_{\mathrm{air}}^{0.8} k_{\mathrm{air}} \pi}$
Related
$k_{\mathrm{air}}$
$\mathrm{Pr}_{\mathrm{air}}$
$\mathrm{Re}_{\mathrm{air}}$
Used in
$T_{\mathrm{a}}$
$T_{\mathrm{s}}$
$T_{\mathrm{t}}$