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Nusselt number, object to duct

Symbol
$\mathrm{Nu}_{int}$
Formulae
$0.188{\mathrm{Ra}_{int}}^{0.322} \left(\frac{L_d}{\delta_d}\right)^{-0.238} \left(\frac{D_{di}}{D_o}\right)^{0.442}$
Related
$D_{di}$
Inner diameter of duct [m]
$D_o$
Outer diameter [m]
$\delta_d$
Distance between cable and duct [m]
$L_d$
Length of duct [m]
$\mathrm{Ra}_{int}$
Rayleigh number inside riser
Used in
$h_{conv,int}$
Convection heat transfer coefficient, object to duct [W/(K.m$^2$)]