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Explanation about positive displacement pump

5 years ago in Research Methods By Rekha Bajaj

Research objective

Can someone briefly explain me positive displacement pump? My research domain is computational fluid dynamics.

All Answers (4 Answers In All)

By Jessica Answered 5 years ago

Yes sure. Positive displacement pumps pulsate. The variation in flow leads to pressure fluctuations in the pipe system. These pumps makes a fluid move by trapping an amount and forcing the trapped volume into the discharge pipe. Positive displacement pumps makes use of an expanding cavity on the suction side and decreasing cavity on the discharge side. Fluid enters into the pump on the suction side as the cavity present on this side expands and fluid flows out of the discharge side as the cavity present on this side decreases.

By Deep Answered 5 years ago

No. Centrifugal pump cannot be considered as a positive displacement pump. This is because centrifugal has varying flow which depends on pressure, whereas the positive displacement pump has constant flow regardless of pressure.

By Buchiramulu Batta Answered 5 years ago

Rekha, viscosity is constant for positive displacement pump. But centrifugal pump has up and down value as their viscosity liquids fill the clearance of the pump causing a higher volumetric efficiency. Positive displacement pump has constant efficiency, which is not in the case of centrifugal pump. Hence this pump cannot be considered as positive displacement pump.

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