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How do you differentiate between positive displacement pump and roto dynamic pump?
NikhilGhotne
Gear pump is a positive displacement pump.
(A positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing (displacing) that trapped volume into the discharge pipe.
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A positive displacement pump has an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pump as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is constant given each cycle of operation.
A positive displacement pump can be further classified according to the mechanism used to move the fluid:
a.Rotary-type, internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, helical twisted roots (e.g. the Wendelkolben pump) or liquid ring vacuum pumps.
b.Reciprocating-type, for example, piston or diaphragm pumps.
Gear pump is generally used for viscous fluid especially in hydraulic service.
Gear pump are used for high head , low flow application.
Widely used on car engine oil pumps. it is also used in various hydraulic power packs..
If you change the direction of gear pump ,suction will become discharge and discharge port become suction port.
Gear pumps requires high degree of close clearances between gears and its housings.
In centrifugal pump you will find above all in reverse .
A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase the pressure and flow rate of a fluid. Centrifugal pumps are the most common type of pump used to move liquids through a piping system. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward or axially into a diffuser or volute chamber, from where it exits into the downstream piping system. Centrifugal pumps are typically used for large discharge through smaller heads.
Centrifugal pumps are most often associated with the radial flow type. However, the term "centrifugal pump" can be used to describe all impeller type rotodynamic pumps including the radial, axial and mixed flow variations.
Gear pump is high efficiency pump while centrifugal pump will have relatively low efficiency.
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