Chemical Engineering - Fluid Mechanics - Discussion

Pitot tube use only measure flowrate.

Pitot tube used for velocity measurements only.

Pitot tube measures the total pressure is absolutely right.

No, it measures local velocity only.

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

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 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.

Total pressure = static + dynamic + hydrostatic.

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

Pitot tube measures only static and dynamic pressure.

Pitot tube use for both static and total pressure.