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+clear;
+clc;
+printf("\t\t\tExample Number 1.7\n\n\n");
+// calculating rate of heat loss from cylinder per unit length
+// solution
+
+Tw =50 ;//[degree celsius] temperature of the cylinder
+
+Tf =25 ;//[degree celsius] temperature of the air
+D=0.02;//[m] diameter of the cylinder
+hm=8;//[W/m^2 degree celcius] mean heat transfer coefficient
+qm=hm*(Tw-Tf);//[W/m^2] heat flux, by Newton's law of cooling
+// Total heat flow rate is qm*A
+//hence heat flow rate per unit length is Q=qm*A/L= qm*%piDL/L = qm*%pi*D
+Q=qm*%pi*D; //[W/m]heat flow rate per unit length
+
+
+printf("The heat flow rate per unit length is %f W/m",Q);