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The divergent section of a venturi meter is longer than the convergent section to gradually decrease the fluid velocity and increase the pressure after the throat, which helps in recovering some of the kinetic energy as pressure energy, reducing energy losses and ensuring accurate flow rate measurement. This design also helps to minimize turbulence and pressure drop in the system.

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Why the divergent part of venturimeter is longer than convergent part?

Actually when the flow emerges from the throat area of venturi to enter into the diverging section, their is a negative pressure gradient i.e, in layman terms fluid is trying to flow from low pressure region to high pressure region according to Bernoulli equation. In this adverse pressure gradient, there is boundary layer separation, in simple terms, the fluid leaves the surface of the wall. Due to this there can be energy loss or the fluid can't recover the pressure fully leading to head loss. So if divergent section is long that means more gradual diverging section, due to which the adverse pressure gradient is less so less chance of boundary separation and hence less loss. Also large diverging section will ensure proper development of flow, i.e. fluid sticking to the wall back after separation.


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Why is the length of the diverging section in a venturi meter longer than the converging?

The length of the diverging section in a venturi meter is longer than the converging section to allow the flow to gradually return to its original pressure and velocity. This helps minimize energy losses and turbulence, ensuring accurate flow measurement. The design aims to maintain steady flow conditions for optimal performance of the venturi meter.