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+//Example 6_9

+clc;clear;

+// Given values

+rho=1;//The density of water in kg/L

+n=300;//rpm

+D=0.01;// Diameter of each jet in m

+V_t=20;// L/s

+V_n=V_t/4;// L/s

+r=0.6;//m

+

+// Calculation

+A_j=(%pi*D^2)/4;//Area of jet in m^2

+V_j=(V_n)/(A_j*1000);//Average jet exit velocity in m/s

+w=(2*(%pi)*n)/60;// The angular momentum of the nozzle in rad/s

+v_n=r*w;//The tangential velocities of the nozzle in m/s

+v_r=V_j-v_n;//The average velocity of the water jet relative to the control volume in m/s

+m_t=rho*V_t;// Mass flow rate in kg/s

+T_shaft=r*m_t*v_r;// The torque transmitted through the shaft in Nm

+W=(w*T_shaft)/1000;

+printf("The electric power generated=%0.1f kW\n",W);