Concept explainers
The net head produced by the centrifugal pump in
The required brake horse power in
Explanation of the angle at which fluid impinges on the impeller blade a critical parameter in the design of centrifugal pump.
Whether the small amount of reverse swirl is desirable or not.
Answer to Problem 68P
The net head produced by the centrifugal pump in
The required brake horse power in
The small amount of reverse swirl is not desirable.
Explanation of Solution
Given information:
The number of rotations of centrifugal pump is
Expression for the angular velocity for the pump
Here, the angular velocity of the centrifugal pump is
Expression for the normal velocity component at the outlet of the pump
Here, the volume flow rate is
Expression for the tangential velocity component at the outlet of the pump
Here, the angle at the outlet of the pump is
Expression for the normal velocity component at the inlet of the pump
Here, the volume flow rate is
Expression for the tangential velocity component at the inlet of the pump
Here, the angle at the inlet of the pump is
Expression for the equivalent head
Here, the equivalent head is
Expression for the horse power
Here, the brake horse power is
Expression for the net head
Here, the net head is
Calculation:
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
If the angle is
The head of the pump increases to small extent, there is a large increase in the required brake horse power. The small amount of reverse swirl is not desirable.
Conclusion:
The net head produced by the centrifugal pump in
The required brake horse power in
The small amount of reverse swirl is not desirable.
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Chapter 14 Solutions
Fluid Mechanics: Fundamentals and Applications
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