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Article | REF: R2210 V4

Determination of fluid flow rate using the velocity-area method

Authors: Jérôme LE COZ, Isabelle CARÉ

Publication date: September 10, 2017, Review date: June 14, 2021

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1. Principle of the integration method

1.1 General principle

Given a fluid that is incompressible and homogeneous, or can be considered as such (for example, below an average velocity of 70 m/s for air), the average volume flow Q vm through a section S of the flow is obtained by space-time integration:

Qvm (t,Δt)=∬S(1Δt∫tt+ΔtVd t) d S
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