Chemical Engineering - Fluid Mechanics - Discussion
Discussion Forum : Fluid Mechanics - Section 1 (Q.No. 11)
11.
With increasing flow rate, the hydraulic efficiency of a centrifugal pump
Discussion:
31 comments Page 4 of 4.
Surya said:
18 hours ago
Why Other Options Are Incorrect?
Monotonically decreases: Incorrect because the pump is highly inefficient at zero flow (shut-off head) due to high turbulence and recirculation.
Efficiency must go up before it can go down.
Decreases and then increases: Incorrect because this describes a U-shaped curve, which is the exact inverse of a standard pump performance characteristic.
Remains constant: Incorrect because a centrifugal pump's hydraulic efficiency is highly dynamic and intrinsically tied to the velocity vectors and fluid flow rates entering the impeller.
Monotonically decreases: Incorrect because the pump is highly inefficient at zero flow (shut-off head) due to high turbulence and recirculation.
Efficiency must go up before it can go down.
Decreases and then increases: Incorrect because this describes a U-shaped curve, which is the exact inverse of a standard pump performance characteristic.
Remains constant: Incorrect because a centrifugal pump's hydraulic efficiency is highly dynamic and intrinsically tied to the velocity vectors and fluid flow rates entering the impeller.
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