H07- Comparison between Hydrostatic & Hydrodynamic Pump

Some of the comparison between positive displacement(Hydrostatic) pump and Non-positive displacement(Hydrodynamic) pumps are as follows.

Positive displacement Pump	Non- Positive displacement Pump
a. The discharge doesn't vary irrespective of outlet resistance.	a. The discharge varies according to resistance at outlet of pump
b. Efficiency of this pump is higher in-comparison with non positive displacement pump	b. Efficiency of this pump is low in-comparison with positive displacement pump.
c. The pump generates high pressure.	c. The pressure generation is comparatively low.
d. Fluid flow per cycle is mostly maintained	d. Fluid flow per cycle varies.
e. Negligible gap between rotating and stationary element.	e. Gap between rotating and stationary element
f. Pump uses change in volume inside the pump to cause fluid flow.	f. Pump uses inertia of fluid to cause fluid flow.
g. There is no slippage in the output of the pump.	g. There will be slippage in the output of the pump.
Example: Gear pump, screw pump, vane pump	Example: Centrifugal pump and axial pump

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