Question: Several cylinders are combined as shown in the longitudinal section of Figure. Find the radial heat flow corresponding to a temperature difference of 40°C. Known are k1 = 0.1 W/m-C, k2 = 0.02 W/m-C, k3 = 25 W/m-C, d1 = 0.050 m, d2 = 0.042 m, d3 = 0.036 m, d4 = 0.030 m, l1 = 1 m, l2 = 0.8 m, l3 = 1.1 m.
