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Can anyone please help me understand the stagnation points? If we look at the comparison between the flow of air over a wing and flow in a pitot tube, the theory says that the velocity is 0 (or very close to 0) for both cases. Having a stream hitting the wing, all the kinetic energy goes into internal energy. This is very intuitive! But why is the velocity considered 0 at the entrance of a pitot tube? It's very counterintuitive for me...

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Can anyone help me to understand this? How can that velocity be 0 at the entrance of the pitot tube? This issues's been following me for days.

Thank you!

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From what I read on Wikipedia (sorry, I'm not an expert), air doesn't flow through the tube. So its velocity is 0.

... the moving fluid is brought to rest (stagnates) as there is no outlet to allow flow to continue

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  • $\begingroup$ Darn! I always though they are opened to ambient because of those two orifices for static pressure... Now it makes more sense. So the hole fills with air and acts as a solid body, right? Is this a correct interpretation? $\endgroup$ – Physther Nov 16 '16 at 20:02

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