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Nusselt number cable—riser

Symbol
$\mathrm{Nu}_{int}$
Formulas
$0.188{\mathrm{Ra}_{int}}^{0.322} \left(\frac{L_{d}}{\delta_{d}}\right)^{-0.238} \left(\frac{D_{di}}{D_{o}}\right)^{0.442}$
Related
$D_{di}$
Inner diameter duct [m]
$D_{o}$
Outer diameter [m]
$\delta_{d}$
Distance cable—duct [m]
$L_{d}$
Length duct [m]
$\mathrm{Ra}_{int}$
Rayleigh number gas→riser
Used in
$h_{conv,int}$
Heat transfer coefficient convection cable—riser [W/(K.m$^2$)]