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+//Fluid system - By - Shiv Kumar

+//Chapter 2 - Impact of Jet

+//Example 2.21

+      clc

+     clear

+//Given Data:-

+        Vi=30;     //velocity of Jet at Inlet of, m/s

+        u=15;     //Velocity of Vane, m/s

+        ui=u;

+        uo=u;

+        alpha_i=32;       //Angle of Jet at Inlet, degrees

+        alpha=125;          //Angle made by Jet at Outlet with direction fo motion of Vanes, degrees

+        alpha_o=180-alpha;      //degrees

+

+//Data Used:-

+     g=9.81;          //Acceleration due to gravity, m/s^2

+     rho=1000;     //Density of water, kg/m^3

+

+//Computations:-

+        Vwi=Vi*cosd(alpha_i);       //m/s

+        Vfi=Vi*sind(alpha_i);        //m/s

+        Vrwi=Vwi-ui;       //m/s

+        beta_i=atand(Vfi/Vrwi);       //degrees

+        Vri=Vfi/sind(beta_i);           //m/s

+        Vro=Vri;

+        beta_o=alpha_o-asind(uo*sind(180-alpha_o)/Vro);     //degrees

+

+        Vrwo=Vri*cosd(beta_o);       //m/s

+        Vwo=Vrwo-uo;           //m/s

+

+    //(a)

+        W=(Vwi+Vwo)*u/g;        //N-m/N  (Answer in textbook is wrong due to wrong value of Vwi used)

+    //(b)Work done by Jet per second, W

+        eta=2*(Vwi+Vwo)*u/(Vi^2)*100;        //In percentage

+

+//Results:-

+     printf("(a)Work done per unit weight of water=%.2f N-m/N  \n", W)        //The answer provided in the textbook is wrong

+     printf("(b)Efficiency of the vane, eta=%.2f percent", eta)        //The answer provided in the textbook is wrong

+