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//Fluid Systems - By - Shiv Kumar
//Chapter 11- Centrifugal Pumps
//Example 11.17
//To Find (a)Manometric Efficiency. (b)Minimum Starting Speed
clc
clear
//Given Data:-
Di=1200; //Inner Diameter of the Impeller, mm
Do=600; //Outer Diameter of the Impeller, mm
N=200; //Speed, rpm
Hm=6; //Manometric Head, m
beta_o=26; // Vane Angle at Outlet, degrees
Vfo=2.5; // Velocity of flow at Outlet, m/s
//Data Used: -
g=9.81; //Acceleration due to gravity, m/s^2
//Computations:-
Di=Di/1000; //m
Do=Do/1000; //m
uo=%pi*Di*N/60; //Tangential Velocity of Impeller at Outlet, m/s
Vwo=uo-Vfo/tand(beta_o); //m/s
//(a)Manometric Efficiency, eta_man
eta_man=g*Hm/(Vwo*uo)*100; //In Percentage
//(b) Minimum Starting Speed, Nmin
Nmin =sqrt(2*g*Hm*60^2/(%pi^2*(Di^2-Do^2))); //rpm
//Results:-
printf("(a)Manometric Efficiency =%.2f Percent \n",eta_man) //The answer vary due to round off error
printf(" (b)Minimum Starting Speed, Nmin =%.f rpm",Nmin) //The answer vary due to round off error
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