A venturimeter is used to
Explanation,
Deriving the measure of the rate of flow,
A venturi meter has two openings, one wide and the other narrow with a cross-sectional area of and respectively.
Assuming the velocity of the fluid at these openings is and at these openings with a pressure of and .
Let's take the flow of fluid to be streamlined with a density of and using Bernoulli’s theorem,
The difference in level in the vertical tubes is, thus
On equating both the equations:
We see,
From equation, we get:
From equation, we get:
Hence the rate of flow of a liquid is
Hence, the flow speed of the incompressible fluid is measured by Venturimeter.