Volumetric flow rate

At a flow rate means the volume of a medium which is moving within a period of time by a cross-section based on the time period.

Furthermore, if the fluids (such as gases and liquids) the relationship:

This formula can be in a known cross-sectional area (pipes, channels ) can be calculated the volume flow rate when the flow rate is measured in one place.

Since the flow velocity is not constant in a cross-section ( see figure ), the mean flow rate is determined by integrating c:

If one needs the mass flow in kg / s, as in incompressible flow is considered:

When changing to section applies to the volume flow at constant density because of conservation of mass:

Designations

• While in hydrology, the discharge rate is referred to as flow, in the natural sciences and engineering, both terms are used. ( Flow measurement, flow rate of fuel )
• Common in the art also: water quantity, air quantity