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diff --git a/3751/CH11/EX11.9/Ex11_9.sce b/3751/CH11/EX11.9/Ex11_9.sce new file mode 100644 index 000000000..67c4b0361 --- /dev/null +++ b/3751/CH11/EX11.9/Ex11_9.sce @@ -0,0 +1,49 @@ +//Fluid Systems - By - Shiv Kumar +//Chapter 11- Centrifugal Pumps +//Example 11.9 +//To Find (i)Vane Angle at Inlet (ii)Work done by Impeller on water per second and (iii)Manometric Efficiency. + + clc + clear + +//Given Data:- + Do=500; //Outer Diameter of the Impeller, mm + Di=250; //Inner Diameter of the Impeller, mm + N=1000; //Speed, rpm + Hm=40; //Manometric Head, m + Vfo=2.5; //Velocity of Flow, m/s + Vfi=Vfo; + beta_o=40; //Vane Angle at outlet, degrees + bo=50; //Width at Outlet, mm + + +//Data Used:- + rho=1000; //Density of water, kg/m^3 + g=9.81; //Acceleration due to gravity, m/s^2 + +//Computations:- + Do=Do/1000; //m + Di=Di/1000; //m + bo=bo/1000; //m + + 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 + Q=%pi*Do*bo*Vfo; //Discharge, m^3/s + + //(i)Vane Angle at Inlet, beta_i + beta_i=atand(Vfi/ui); //degrees + + //(ii) Work done by Impeller on water per sec, W + Vwo=uo-Vfo/tand(beta_o); //m/s + W=rho*Q*Vwo*uo/1000; //kN-m/s + + //(iii) Manometric Efficiency, eta_man + eta_man=g*Hm/(Vwo*uo)*100; //In Percentage + + +//Results:- + printf(" (i)Vane Angle at Inlet, beta_i=%.2f Degrees \n ",beta_i) //The answer vary due to round off error + printf(" (ii) Work done by Impeller on water per sec =%.3f kN-m/s \n ",W) //The answer vary due to round off error + printf(" (iii) Manometric Efficiency, eta_man =%.2f Percent \n ",eta_man) //The answer vary due to round off error + + |