Factor G to calculate Nusselt number

Symbol
$G_{encl}$
Formulae
$\left(\frac{0.00841653357321576}{\left(\mathrm{Pr}_{gas}^{0.7} + 0.153846153846154\right)^{5}} + \frac{1}{\left(\frac{0.6}{\mathrm{Pr}_{gas}^{0.7}} + 1\right)^{5}}\right)^{-0.2}$
Related
$\mathrm{Pr}_{gas}$
Used in
$\mathrm{Nu}_{encl}$