Expert ForumsMixing

Topic: Re: Power consumption equation

posed by 
Mixer Power
Power = Power Number x Density x Rotational Speed3 x Impeller Diameter5
for common engineering units:
Power (P) - horsepower
Power Number (Np) - dimensionless quantity depending on impeller
geometry - a constant for turbulent conditions and geometric
similarity - need to know geometry of impeller for value (typical values between 0.3 and 6.0)
Density ( - specific gravity w/respect to water
Rotational Speed (N) – rpm
Impeller Diameter (D) – inches
Viscosity is not a factor for turbulent conditions
P = Np x ( x N3 x D5/1.524x1013