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Diffstat (limited to '3751/CH11/EX11.20')
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diff --git a/3751/CH11/EX11.20/Ex11_20.sce b/3751/CH11/EX11.20/Ex11_20.sce new file mode 100644 index 000000000..98e25858e --- /dev/null +++ b/3751/CH11/EX11.20/Ex11_20.sce @@ -0,0 +1,48 @@ +//Fluid Systems - By - Shiv Kumar +//Chapter 11- Centrifugal Pumps +//Example 11.20 +//To Determine (i)Head generated by the Pump (ii)Shaft Power required to run the Pump. + + clc + clear + +//Given Data:- + n=3; //Number of Stages + Do=400; //Diameter of the Impeller at Outlet, mm + bo=20; //Width of Impeller at outlet, mm + beta_o=45; //degrees + Area_per=10; //Percentage of Total Area which is reduced. + eta_o=80/100; //Overall Efficiency + eta_man=90/100; //Manometric Efficiency + N=1000; //Speed, rpm + Q=0.05; //Discharge, m^3/s + + +//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 + bo=bo/1000; //m + A=%pi*Do*bo*(1-Area_per/100); //Actual Area of Flow, m^2 + + uo=%pi*Do*N/60; //Tangential Velocity of Impeller at Outlet, m/s + Vfo=Q/A; //Velocity of Flow, m/s + Vfi= Vfo; + Vwo=uo-Vfo/tand(beta_o); //m/s (Value given in book is wrong due to incorrect value of beta_o is used) + + // (i)Head generated by the Pump , H_Tm + Hm=eta_man*Vwo*uo/g; //m + H_Tm=n*Hm; //m + + //(ii) Shaft Power required to run the Pump , P + P=rho*Q*g*H_Tm/(eta_o*1000); //kW + + +//Results:- + printf(" (i)Head generated by the Pump , H_Tm=%.2f m \n",H_Tm) //The answer provided in the textbook is wrong + printf(" (ii) Shaft Power required to run the Pump , P =%.2f kW \n",P) //The answer provided in the textbook is wrong + + |