Different principles of speed measurement
Local measurement of velocity in a fluid
Quizzed article REF: R2110 V3
Different principles of speed measurement
Local measurement of velocity in a fluid

Author : Isabelle CARÉ

Publication date: September 10, 2013, Review date: June 14, 2021 | Lire en français

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1. Different principles of speed measurement

1.1 Speed measurement with pressure sensor

A pressure sensor measures a pressure difference from which the modulus of flow velocity can be deduced. Some instruments allow simultaneous measurement of flow direction.

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1.1.1 Reminder of fluid mechanics

Consider a small parallelepiped dxdydz in a laboratory coordinate system, with mass equal to unity, to which we apply the fundamental equation of dynamics (Newton's equation):

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