... unit offorce is the 4 Fluid Mechanics, Thermodynamics of Turbomachinery newton (N), defined as that force which, when applied to a mass of lkilogram, gives an acceleration to the mass of ... speed and c, the average axial velocity. Since Q = c, x flow area cc c,D2 and UccND. then Q cx ND3 U - cc Fluid Mechanics and Thermodynamics of Turbomachinery Fourth Edition, ... dimensional and any values of specific speed obtained using them would then depend upon the choice of the units employed. The dimensionless form of N, (and Nsp) is the only one used in this...