def Δp(f, L, D, ρ, v):
return f * (L / D) * (ρ * v**<NUM_LIT:2> / <NUM_LIT:2>)<EOL>
Calculate the pressure drop for turbulent flow in a duct.

:param f: Duct Darcy friction factor.
:param L: [m] Duct length.
:param D: [m] Duct hydraulic diameter.
:param ρ: [kg/m3] Fluid density.
:param v: [m/s] Average fluid velocity.
:return: [Pa] Pressure drop.

Source: lienhard2018, Eq. 3.25.