Chemical Engineering - Fluid Mechanics - Discussion

Pitot tubes were invented by Henri Pitot in 1732 to measure the flowing velocity of fluids. Basically a differential pressure (d/p) flow meter, a pitot tube measures two pressures: the static and the total impact pressure.

Pitot tube measure mainly of
1) Point Velocity and 2) Total pressure.
And always remember that total pressure and stagnation pressure is the same, i.e. Static Pressure+ and Dynamic Pressure.

Pitot tube use for both static and total pressure.

Pitot tube measures only static and dynamic pressure.

Total pressure = static + dynamic + hydrostatic.

But pitot tube measures only static + dynamic i.e. stagnation pressure.

The basic pitot tube consists of a tube pointing directly into the fluid flow. As this tube contains fluid, a pressure can be measured; the moving fluid is brought to rest (stagnates) as there is no outlet to allow flow to continue. This pressure is the stagnation pressure of the fluid, also known as the total pressure or (particularly in aviation) the pitot pressure.

The measured stagnation pressure cannot itself be used to determine the fluid flow velocity (airspeed in aviation).

However, Bernoulli's equation states:
Stagnation pressure = static pressure + dynamic pressure.

The basic pitot tube consists of a tube pointing directly into the fluid flow. As this tube contains fluid, a pressure can be measured; the moving fluid is brought to rest (stagnates) as there is no outlet to allow flow to continue. This pressure is the stagnation pressure of the fluid, also known as the total pressure or (particularly in aviation) the pitot pressure.

A new version of pitot measures pressure drop, viscosity and density.

No, it measures local velocity only.

Pitot tube measures the total pressure is absolutely right.