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Compare positive displacement pump with Rotodynamic pump.
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Positive Displacement Pump Roto dynamic Pump
1.Delivers fluid in discrete volume per cycle 1.Delivery is continuous
2.After finishing on delivery stroke completely , only the next suction stroke can start 2.Suction & delivery can keep on going continuously & simultaneously.
3.Discharge is independent of the resisting pressure at delivery 3.As resistance increases the discharge reduces.
4.Discharge depends only on speed 4.Discharge depends on resisting pressure
5.Work done on the fluid is in the form of pressure energy 5.Work done is in the form of kinetic energy
6.There is no limit to the maximum pressure that can be built 6.The maximum pressure that can be developed is limited
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