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The classical derivation of the Pitot tube equation assumes that the fluid is in a steady flow to use the Bernoulli equation version for steady flows. But in practice, does Pitot tube can be used also for unsteady flows?

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    $\begingroup$ Yes. The length scale over which pitot tubes operate is very short, so it is valid to consider the unsteady flow as quasi-steady. $\endgroup$ – Chet Miller Nov 8 at 19:13
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Certainly. Unsteady flows (i.e., where the flow velocity changes with time, sometimes quickly) happens all the time in aviation, and pitot tubes are used almost universally to monitor airspeed in planes.

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  • $\begingroup$ Thanks. It is because of the approximation of the unsteady flow by a quasi-steady flow as Chet Miller has commented or there is also other reasons? $\endgroup$ – shamisen Nov 12 at 0:19
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    $\begingroup$ it is also because the pitot tube-driven airspeed gauge mechanism itself does a significant amount of pressure "averaging" in its readout. $\endgroup$ – niels nielsen Nov 12 at 1:08

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