Displacement and centrifugal pump

Displacement and centrifugal pump?

how does each class of these pumps work?

Other Answers:

Don't you think the clue is in the names ?

one has the equivalent of a piston

the other rotates the fluid until centrifugal forces
send some of the fluid down an exit port

In mechanical pumps ghe fluid is conveyed by direct contact with a moving part of the pumping machinery. The two basic types are (1) velocity machines, centrifugal or turbine pumps, which impart energy to the fluid primarily by increasing its velocity, then converting part of this energy into pressure or head, and (2) displacement machines with plungers, pistons, cams, or other confining forms which act directly on the fluid, forcing it to flow against a higher pressure. See also Centrifugal pump; Displacement pump.