Question

Can someone explain what is happening in this diagram why are there two exits for pressure P in the actual tube.

Pitot-static tube To manometer Po Bernoulli's equation along AO: 2

Answer 1

Answer-

• This is the pitot static tube which is used to determine the speed of flow inside the pipe.
• For determining the speed of flow in pitot static tube, we need the static head, dynamic head and stagnation head. Static head + dynamic head = stagnation head
• Here, two exit ports are connected to manometers which direclty give the values of pressure.
• The P exit port give the value of static pressure, P₀ exit port give the value of stagnation pressure.
• This two values can be used to determine the value of dynamic pressure as dynamic pressure = Stagnation pressure - static pressure. Dynamic pressure, $\frac{\rho U^{2}}{2} = P_{0} - P$

• Speed    $U = \sqrt{\frac{2(P_{0}- P)}{\rho }}$