(idea) by Professor Pi Mon Oct 09 2000 at 3:06:29

A dimensionless number used in momentum transfer in general and power consumption by agitators, fans, pumps, etc. calculations in particular. It is proportional to (Drag force) / (Inertial Force).

NP = (gc P) / N3 rho D5)

D: characteristic length, gc: dimensional constant, N: rate of rotation, P: power, rho: density

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