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diff --git a/3751/CH11/EX11.14/Ex11_14.sce b/3751/CH11/EX11.14/Ex11_14.sce new file mode 100644 index 000000000..bc0da4a1d --- /dev/null +++ b/3751/CH11/EX11.14/Ex11_14.sce @@ -0,0 +1,59 @@ +//Fluid Systems - By - Shiv Kumar +//Chapter 11- Centrifugal Pumps +//Example 11.14 +//To Find (a)Vane Angle of Impeller at Inlet (b) Overall Efficiency of the Pump (c) Manometric Efficiency of the Pump. + + clc + clear + +//Given Data:- + Do=400; //Diameter of the Impeller at Outlet, mm + Di=200; //Diameter of the Impeller at Inlet, mm + N=1000; //Speed, rpm + Q=39; //Discharge, litres/s + Vfo=2.2; //Velocity of Flow, m/s + Vfi=Vfo; + Ds=150; //Diameter of Suction Pipe, mm + Dd=100; //Diameter of Delivery Pipe, mm + h_s=6; //Suction Head, m of water (abs) + h_d=30; //Delivery Head, m of water (abs) + P=15.75; //Power required to drive the pump, kW + beta_o=45; //Vane Angle at outlet, degrees + + +//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 + Ds=Ds/1000; //m + Dd=Dd/1000; //m + Q=Q/1000; //m^3/s + P=P*1000; //W + + //(a)Vane Angle of Impeller at Inlet, beta_i + ui=%pi*Di*N/60; //m/s + beta_i=atand(Vfi/ui); //degrees + + // (b) Overall Efficiency of the Pump + As=(%pi/4)*Ds^2; //m^2 + Ad=(%pi/4)*Dd^2; //m^2 + Vd=Q/Ad; //m/s + Vs=Q/As; //m/s + Hm=(h_d+Vd^2/(2*g))-(h_s+Vs^2/(2*g)); //m + eta_o=rho*Q*g*Hm/P*100; //In percentage + + + // (c) Manometric Efficiency of the Pump, eta_man + uo=%pi*Do*N/60; // Tangential velocity of Impeller at Outlet, m/s + Vwo=uo-Vfo/tand(beta_o); //m/s + eta_man=g*Hm/(Vwo*uo)*100; //In Percentage + + +//Results:- + printf(" (a)Vane Angle of Impeller at Inlet, beta_i=%.2f Degrees \n ",beta_i) //The answer vary due to round off error + printf(" (b) The Overall Efficiency of the Pump, eta_o =%.2f Percent \n ",eta_o) //The answer vary due to round off error + printf(" (c) Manometric Efficiency of the Pump, eta_man =%.2f Percent \n ",eta_man) //The answer vary due to round off error + |