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Convection heat transfer coefficient, object to gas

Symbol
$h_{conv,og}$
Unit
W/(K.m$^2$)
Formulae
$\frac{k_{gas} \mathrm{Nu}_{og}}{L_d}$general case (Hartlein & Black)
$\frac{k_{gas} \mathrm{Nu}_{og}}{\delta_d}$Riser open at both ends, 133 ≤ $Ra$ ≤ 7000 (Hartlein & Black IIa)
$\frac{k_{gas} \mathrm{Nu}_{og}}{\delta_d}$Riser closed at both ends (Anders)
$\frac{\left(0.46\frac{D_{di}}{D_o}+0.54\right) k_{gas} \mathrm{Nu}_{og}}{\delta_d}$Riser open at both ends (Anders)
$\frac{k_{gas} \mathrm{Nu}_{og}}{L_d}$Riser open at top and closed at bottom (Anders)
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]
$\mathrm{Nu}_{og}$
Nusselt number, object to gas
Used in
$h_{conv,gd}$
Convection heat transfer coefficient, gas to duct [W/(K.m$^2$)]
$W_{conv,og}$
Convection heat transfer, object to gas [W/m]