Question

Define power number Np​

Answer 1

Explanation:

The power number Np (also known as Newton number) is a commonly used dimensionless number relating the resistance force to the inertia force.

The power-number has different specifications according to the field of application. E.g., for stirrers the power number is defined as:[1]

{\displaystyle N_{\mathrm {p} }={\frac {P}{\rho n^{3}D^{5}}}}{\displaystyle N_{\mathrm {p} }={\frac {P}{\rho n^{3}D^{5}}}}

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Answer 2

The power number Np (also known as Newton number) is a commonly used dimensionless number relating the resistance force to the inertia force.

The power-number has different specifications according to the field of application. E.g., for stirrers the power number is defined as:[1]

{\displaystyle N_{\mathrm {p} }={\frac {P}{\rho n^{3}D^{5}}}}{\displaystyle N_{\mathrm {p} }={\frac {P}{\rho n^{3}D^{5}}}}

with

P: power

ρ: fluid density

n: rotational speed

D: diameter of stirrer