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Venturimeter Principle

A venturimeter is a device used for measuring the rate of a flow of a fluid flowing through a pipe.
It consists of three parts.

  1.  A short converging part
  2.  Throat
  3.  Diverging part

It is based on the principle of Bernoulli’s equation. Inside of the venturimeter pressure difference is created by reducing the cross-sectional area of the flow passage. The pressure difference is measured by using a differential U-tube manometer. This pressure difference helps in the determination of rate of flow of fluid or discharge through the pipe line. As the inlet area of the venturi is large than at the throat, the velocity at the throat increases resulting in decrease of pressure. By this, a pressure difference is created between the inlet and the throat of the venturi.

venturimeter

Let
D1 and D2  —  Diameter at inlet and throat respectively
P1and P2    —  Pressure at inlet and throat
V1 and V2  — Velocity at inlet ad throat

venturimeter

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3 comments

  1. Why we can't able to replace this heavier flow metres with small digital or analog flow meters

  2. Every meter has its own advantages and disadvantages.

    Despite these meters being heavy, they are more rugged and since they have no moving parts hence less wear and tear that is good for long term benefit.

  3. good explain and best understanding

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