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+clc;
+disp("Example 4.20")
+d=0.05 // in m
+G= 125 // Massflow rate per crosssection area in kg/m^2/s
+mew= 0.025 // in kg/ms
+Re=d*G/mew
+density=800
+V=G/density
+Vmax= 2*V
+Vgrad= -2*Vmax*2/d
+disp(Vgrad,"Velocity gradient on the wall is ")