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Power number

The power number N_p (also known as Newton number) is a dimensionless number relating the resistance force[?] to the inertia force. In engineering, this number, along with the Reynolds number, is one of the most widely employed dimensionless numbers.

The power-number has different specifications according to the field of application. E.g., for stirrers[?] the power number is defined as:

N_p=M_t/ρ/n³/d⁵

with

M_t: torque
ρ: fluid density
n: rotational speed[?]
d: diameter of stirrer

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