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Convection heat transfer coefficient, object to duct

Symbol
$h_{conv,int}$
Unit
W/(K.m$^2$)
Formulae
$\frac{k_{gas} \mathrm{Nu}_{int}}{\delta_d}$Chippendale
$\frac{k_{gas}}{\delta_d} 0.188{\mathrm{Ra}_{int}}^{0.322} \left(\frac{L_d}{\delta_d}\right)^{-0.238} \left(\frac{D_{di}}{D_o}\right)^{0.442}$IEC 60287
Related
$D_{di}$
Inner diameter of duct [m]
$D_o$
Outer diameter [m]
$\delta_d$
Distance between cable and duct [m]
$k_{gas}$
Thermal conductivity for gas [W/(m.K)]
$L_d$
Length of duct [m]
$\mathrm{Nu}_{int}$
Nusselt number, object to duct
$\mathrm{Ra}_{int}$
Rayleigh number inside riser
Used in
$T_{4i}$
Thermal resistance of medium in the duct [K.m/W]
$W_{conv,int}$
Convection heat transfer, object to duct [W/m]