n₂, D₂).

Fan affinity laws

The equations below are the fan affinity laws: (see for more info)

Volume flow rate:
: Head or pressure gain:
:

Power consumption:
:

where
* is the volumetric flow rate (units length^3/time)
* is the impeller diameter (units of length)
* is the shaft rotational speed (units of 1/time)
* is the fluid density (units of mass/length^3)
* is the pressure or head developed by the fan/pump

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