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+// Example 6_11
+clc;funcprot(0);
+// Given data
+D_i=3;// The inner diameter of hollow cylinder in cm
+D_o=10;// The outer diameter of hollow cylinder in cm
+L=20;// Length in cm
+Q=1;// The fuel flow rate in l/min
+mu=2*10^-6;// The fuel viscosity in Pa s
+k=1*10^-6;// The fuel filter permeability in m^2
+
+// Calculation
+// Assume dp=p_in-p_out
+dp=((mu*Q/60)/(2*%pi*k*L/100))*log(D_o/D_i);// The pressure drop in Pa
+printf("\n The pressure drop,p_in-p_out=%1.3e Pa",dp);