Convection heat transfer coefficient, object to gas

Symbol
$h_{conv,og}$
Unit
W/(K.m$^2$)
Formulae
$\frac{k_{gas} \mathrm{Nu}_{og}}{\delta_d}$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)
$\frac{k_{gas} \mathrm{Nu}_{og}}{L_d}$General case (Hartlein & Black)
$\frac{k_{gas} \mathrm{Nu}_{og}}{\delta_d}$Riser open at both ends, 133 ≤ $Ra$ ≤ 7000 (Hartlein & Black IIa)