Hydraulics and Fluid Mechanics in ME
In reaction turbine, draft tube is used

To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
For safety of turbine
To transport water downstream without eddies
To increase flow rate

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Hydraulics and Fluid Mechanics in ME
Overall efficiency of a centrifugal pump is the ratio of

Energy available at the impeller to the energy supplied to the pump by the prime mover
Actual work-done by the pump to the energy supplied to the pump by the prime mover
Manometric head to the energy supplied by the impeller per kN of water
Energy supplied to the pump to the energy available at the impeller

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