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+// Example 8_13
+clc;funcprot(0);
+// Given data
+T=20.0+273.15;// K
+mu=0.700;// N.s/m^2
+L=0.100;// m
+R_1=0.0500;// m
+R_2=0.0510;// m
+n=1000;// rev/min
+
+// Solution
+omega=(2*%pi*n)/60;// rad/s
+S_P_W=((2*%pi*L*omega^2*R_1^4*mu)/((R_2^2-R_1^2)^2*T))*((2*R_2^2*(log(R_2/R_1)))+((R_2^4)/(2*R_1^2))-(R_1^2/2));// W/K
+printf("\nThe rate of entropy production due to laminar viscous losses,(S_P)w=%1.2f W/K",S_P_W);