Flow coefficient

The flow coefficient (φ) is a dimensionless quantity used to describe the volume flow rate. It is also referred to as the volume or volume flow coefficient and characterises the flow rate (Q).

When the flow rate varies at constant rotational pump speed, vm ~ Q and therefore φ ~ Q.

The flow coefficient (φ) is therefore indicative of the abscissa (analogous to Q) on H/Q curves plotted in non-dimensional representation. With reference to the vane inlet and outlet diameters, the following equations are obtained:

With regard to the head coefficient, it is preferable to adopt the flow coefficient related to the impeller outlet.

  

  

Become part of our team!

As an international employer, KSB offers exciting challenges in many different areas.

Regardless whether you are an experienced professional or a pupil, student or graduate ─ learn more about our work culture and find job openings from all over the world in our job portal.