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Free cross-sectional area inside duct

Cross-sectional area of empty duct minus the cross-sectional area of all objects inside the duct.

Symbol
$A_{d,fill}$
Unit
mm$^2$
Formulae
$\frac{\pi}{4} \left({Di_d}^2-N_c {D_e}^2\right)$
Related
$D_e$
External diameter of object [mm]
$Di_d$
Inner diameter of duct [mm]
$N_c$
Number of sources in system
$\pi$
Archimedes' constant $\pi$
Used in
$Q_{d,fill}$
Thermal capacitance of duct filling [J/(m.K)]