Dave Dickey Forum Moderator 292 Posts
Re: Power consumption equation26 June 2007 at 1:29pmMixer 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 (sp.gr.) - 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 (sp.gr.) x N3 x D5/1.524x1013
I would like to know the formula for calculating power consumption for an agitator and grinding mill. I have all the process data information for this equipment, but I dont know how to calculate approximate power from the data.
Have an insight or suggestion?
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