Flow measurement: pitot tube, venturi meter and orifice meter

Abstract

In the previous programme we saw that the relationship between the pressure p, the velocity u and the elevation z of a flowing fluid is given by Bernoulli’s equation:

$$\frac{p}{\rho } + \tfrac{1}{2}{u^2} + gz = constant$$

The equation applies only along a single streamline, and does noι relate the situation on one streamline to that on another, even in the same flow.