The drag of an airfoil at zero angle of attack is a function of density, viscosity, and velocity, in addition to a length parameter



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Momentum equation in the x-direction:





(ii)
Drag coefficient:

[ f’ = Fanning Friction Factor]


(iii)
Hydraulic diameter: (iv)

w means wetted


(wetted perimeter)

For a circular duct of diameter D, and length L,




h

b



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