Basic Technical Terms Of Centrifugal Pumps

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A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.

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Volute

- area enlarge along flow direction

- create uniform velocity distribution

Diffuser

- large size centrifugal pump

- guide vanes surround the impeller

- fluid flow decelerated while directed to enter the volute

Impeller

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Theoretical Assumptions:

• No tangential flow in the blade passage

• Impeller blades are Infinitely thin

• No Velocity variation across impeller width

• Analysis only at inlet and outlet

• Radial inlet flow

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