Power number is dimensionless parameter used for estimating the power consumed by the mixing impeller.
For a standard vessel geometry, the power consumed by an impeller at a specified rotational speed, for a liquid with known density, can be determined from the power number correlation.
P = Np ρn3Da
P = Impeller power, Watts
Np = Power number
ρ = Density of liquid, kg/m3
n – Agitator speed measured in revolutions / second
Da – Impeller diameters in meters
Power number data for different type of impellers, under a give set of conditions are documented in technical literature. Typical values of power number are as under:
- Power number decreases with an increase in Reynolds number.
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