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Venturimeter: Construction, Working Principle, Advantages and Disadvantages of Venturimeter


 Venturimeter is a measuring instrument or a device used for measuring the rate of flow of fluid in the pipe. This instrument consists of different parts which is explained in construction, there are an inlet, throat, and outlet to it. The inlet area of Venturimeter is larger than the throat, there is a reducing cross-sectional area from inlet to throat. by this difference in the cross-sectional area, the fluid flow pressure difference is measured using a U-tube manometer. this pressure difference is used to find the rate of flow of fluid in the pipe.

Construction of Venturimeter:

Venturimeter consist of three main parts called,
*) Convergent nozzle.
*) Throat.
*) Divergent nozzle.

*)Convergent nozzle:
A convergent nozzle is present at the starting of venturimeter which is attached to the throat first end. the convergent nozzle consist of a  decreasing cross-sectional area.

*) Throat:
Throat is present in the middle of venturimeter. and this is attached to the end of the convergent nozzle. throttle consist of an equal diameter throughout the length.

*) Convergent nozzle:
Convergent nozzle is attached to the end of the throat. convergent nozzle consist of increasing cross-sectional area.

Working principle of Venturimeter:

When the fluid used to pass through the venturi meter there is no difference in inlet but at the throat, the velocity is used to increased and there is a decrease in pressure this is due to decreasing cross-sectional area from inlet to throat. this pressure difference in between inlet and throat is determined by the help od U-tube manometers, this pressure difference is used to calculate the flow rate of fluid in the pipe.

Advantages of Venturimeter:

  • This has high wear resistance.
  • In this we can measure the accurate flow of fluid.
  • Head losses are less.
  • Pressure recovery is high.

Disadvantages of Venturimeter:

  • It required more space.
  • Installation cost is high.
  • Construction is complex.
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