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Power number : Power-Number

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Power number : Power-Number

The power number Np (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:

Np=Mt/ρ/n3/d5

with


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