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Distance cable—duct

Symbol
$\delta_d$
Unit
m
Formulas
$\frac{D_{di}}{2}-\frac{D_o}{2}$
Related
$D_{di}$
Inner diameter duct [m]
$D_o$
Outer diameter [m]
Used in
$\mathrm{Gr}_{gd}$
Grashof number gas—duct
$\mathrm{Gr}_{og}$
Grashof number cable—gas
$h_{conv,gd}$
Heat transfer coefficient convection gas—duct [W/(K.m$^2$)]
$h_{conv,int}$
Heat transfer coefficient convection cable—riser [W/(K.m$^2$)]
$h_{conv,og}$
Heat transfer coefficient convection cable—gas [W/(K.m$^2$)]
$\mathrm{Nu}_{int}$
Nusselt number cable—riser
$\mathrm{Nu}_{og}$
Nusselt number cable—gas
$\mathrm{Ra}_{int}$
Rayleigh number gas→riser