Problem 2: A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radial at the inlet of the rotor. The pump has the following characteristics: Flow rate Inlet diameter Outlet diameter Head Width at the inlet Width at the outlet Leakage Mechanical loss Blade angle at the outlet The water density Atmospheric pressure Q-72 L/s DI - 90 mm D2 - 280 mm H= 25m bl -20 mm b2 = 18 mm q -2 L/s Pm = 1.41 kW B: - 35 p = 998 kg/m³ 101 kPa 1) Draw the velocity triangles at the inlet and the exit of the impeller. 2) Determine the magnitude of the absolute velocity of the flow (V) and the impeller velocity (U) at the inlet and outlet 3) Determine the blade angle at the inlet. 4) Determine the hydraulic, mechanical and volumetric efficiencies. 5) Determine the minimum number of blades required for the slip to not exceed 0.9. 6) Determine the static pressure difference (P.-Pi) through the impeller by using Bernoulli equation. 7) Determine the available NPSH if the pump is placed 2m above the free surface of the tank and the vapor pressure is Pv = 2.43 Kpa.

Problem 2: A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radial at the inlet of the rotor. The pump has the following characteristics: Flow rate Inlet diameter Outlet diameter Head Width at the inlet Width at the outlet Leakage Mechanical loss Blade angle at the outlet The water density Atmospheric pressure Q-72 L/s DI - 90 mm D2 - 280 mm H= 25m bl -20 mm b2 = 18 mm q -2 L/s Pm = 1.41 kW B: - 35 p = 998 kg/m³ 101 kPa 1) Draw the velocity triangles at the inlet and the exit of the impeller. 2) Determine the magnitude of the absolute velocity of the flow (V) and the impeller velocity (U) at the inlet and outlet 3) Determine the blade angle at the inlet. 4) Determine the hydraulic, mechanical and volumetric efficiencies. 5) Determine the minimum number of blades required for the slip to not exceed 0.9. 6) Determine the static pressure difference (P.-Pi) through the impeller by using Bernoulli equation. 7) Determine the available NPSH if the pump is placed 2m above the free surface of the tank and the vapor pressure is Pv = 2.43 Kpa.

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 fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.

Question

Problem 2:
A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radial
at the inlet of the rotor. The pump has the following characteristics:
|Q-72 L/s
DI = 90 mm
D2 = 280 mm
Flow rate
Inlet diameter
OUutlet diameter
Нead
Width at the inlet
Width at the outlet
Leakage
Mechanical loss
Blade angle at the outlet
The water density
Atmospheric pressure
Н- 25m
bl -20 mm
b2 = 18 mm
9 =2 L/s
Pm = 1.41 kW
B: = 35
p = 998 kg/m³
101 kPa
1) Draw the velocity triangles at the inlet and the exit of the impeller.
2) Determine the magnitude of the absolute velocity of the flow (V) and the impeller velocity
(U) at the inlet and outlet
3) Determine the blade angle at the inlet.
4) Determine the hydraulic, mechanical and volumetric efficiencies.
5) Determine the minimum number of blades required for the slip to not exceed 0.9.
6) Determine the static pressure difference (P:-P1) through the impeller by using Bernoulli
equation.
7) Determine the available NPSH if the pump is placed 2m above the free surface of the tank
and the vapor pressure is Pv = 2.43 Kpa.

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