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diff --git a/3751/CH11/EX11.12/Ex11_12.sce b/3751/CH11/EX11.12/Ex11_12.sce new file mode 100644 index 000000000..0f946d77d --- /dev/null +++ b/3751/CH11/EX11.12/Ex11_12.sce @@ -0,0 +1,48 @@ +//Fluid Systems - By - Shiv Kumar +//Chapter 11- Centrifugal Pumps +//Example 11.12 +//To Determine (i)Manometric Efficiency (ii)Vane Angle at Inlet (iii)The Least Speed at which the pump commence to work. + + clc + clear + +//Given Data:- + Do=0.5; //Outer Diameter of the Impeller, m + N=600; //Speed, rpm + Q=8000; //Discharge, litres/min. + Hm=8.5; //Manometric Head, m + Di=0.25; //Inner Diameter of Impeller, m + beta_o=45; //Vane Angle at outlet, degrees + Af=0.06; //Area of Flow, m^2 + + +//Data Used:- + g=9.81; //Acceleration due to gravity, m/s^2 + +//Computations:- + Q=Q/60000; //m^3/s + + Vfo=Q/Af; //m/s + Vfi=Vfo; + ui=%pi*Di*N/60; //Tangential velocity of Impeller at Inlet,m/s + uo=%pi*Do*N/60; // Tangential velocity of Impeller at Outlet, m/s + Vwo=uo-Vfo/tand(beta_o); //m/s + + //(i) Manometric Efficiency, eta_man + eta_man=g*Hm/(Vwo*uo)*100; //In Percentage + + + //(ii) Vane Angle at Inlet, beta_i + beta_i=atand(Vfi/ui); //degrees + + //(iii) The Least Speed at which the pump commence to work, Nmin + Nmin=120*Vwo*Do*(eta_man/100)/(%pi*(Do^2-Di^2)); //rpm + + + +//Results:- + printf(" (i) Manometric Efficiency, eta_man =%.2f Percent \n ",eta_man ) //The answer vary due to round off error + printf(" (ii) Vane Angle at Inlet, beta_i=%.2f Degrees \n ",beta_i ) //The answer vary due to round off error + printf(" (iii) The Least Speed at which the pump commence to work, Nmin=%.2f rpm \n",Nmin ) //The answer vary due to round off error + + |