Answered: A centrifugal pump is pumping water at…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A centrifugal pump is pumping water at the design conditions with a flowrate of 2300 gpm and a tangential velocity of U₂=65ft/s. The flow passage area at the outlet is A₂=1ft². About 5% of the flow is recirculated internally and pumped again. The actual head rise of the pump is 94ft and the blade angle at outlet is 28º. Knowing that the total number of blades is Z_b=24, the power needed to operate the pump is P_s=65hp.

Take g = 9.81 m/s² = 32.2 ft/s² & ρ_w = 998 kg/m³ =1.94 Slug/ft³.

Estimate the theoretical head of the pump in ft using Stodola’s formula (H_i).

Determine the mechanical efficiency of the pump (η_m).

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