Centrifugal Pump
Fluid flows in axially and leaves radially outward i.e. in centrifugal direction , hence the name Centrifugal pump
At the eye of impeller partial vacuum is created and due to atmospheric pressure at the suction side, pressure difference is created due to which fluid flows.
- Fluid enters pump (suction side) ---> rotating impeller pushes the liquid increasing velocity ---> liquid is discharged (discharging side) .
- Mechanical Energy (motor) ---> Kinetic Energy (fluid) --> Potential Energy
( The impeller provides more Kinetic energy to the fluid. This Kinetic energy decreases as it moves up giving rise to Potential energy (head). KE decreases due to pump casing which slows down the
fluid due to resistance. )
HEAD : The maximum height straight up, the fluid can travel. It is a function of outer dia. of Impeller & motor speed.
Pump Head + Suction Head = Discharge Head .
Typical properties of centrifugal pump : ( reason why it is widely used )
- constant head
- varying flow
- can handle huge amount of fluid at a time
- suitable for LOW viscous fluids.
- high speed flow.
I am surprised to note that you said centrifugal pumps give - 'Constant Head'. If you go through fundamentals centrifugal pump work on different dynamic forces so it can not generate CONSTANT HEAD.
ReplyDeleteWhat I meant was that centrifugal pumps give constant head irrespective of the type of fluid used
DeleteYou say, "At the eye of impeller partial vacuum is created and due to atmospheric pressure at the suction side". It would be better put "At the eye of impeller a lower pressure is created than at the suction. If the suction is atmospheric pressure, then a slight vacuum is created"
ReplyDeleteJust thought I would clarify. Most industrial pumps are provided with NPSH (Net Positive Suction Head) greater than atmospheric due to static head of the tank which the pump suction is connected to.
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ReplyDeletethanks a lot for sharing
Centrifugal pumps