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Nusselt number, gas to enclosure

The formula is based on Kuehn and Goldstein 'Correlating equations for natural convection heat transfer between horizontal circular cylinders', 1976 who presented a correlation for natural convection heat transfer from a horizontal cylinder which is valid at any Rayleigh and Prandtl number.

Symbol
$\mathrm{Nu}_{encl}$
Formulae
$\frac{-2}{\ln\left(1-\frac{2}{\left(\left(0.587G_{encl} {\mathrm{Ra}_{encl}}^{\frac{1}{4}}\right)^{15}+\left(0.12{\mathrm{Ra}_{encl}}^{\frac{1}{4}}\right)^{15}\right)^{0.0667}}\right)}$
Related
$G_{encl}$
Factor G for the calculation of the Nusselt number
$\mathrm{Ra}_{encl}$
Rayleigh number, gas to enclosure
Used in
$h_{conv,encl}$
Convection heat transfer coefficient, gas to enclosure [W/m2.K]