Two long, eccentric cylinders having diameters of 20 and 5 cm, respectively, are maintained at 100 and 20◦C and separated by a material with k =2.5W/m · ◦C. The distance between centers is 5.5 cm....

Two long, eccentric cylinders having diameters of 20 and 5 cm, respectively, are
maintained at 100 and 20◦C and separated by a material with k =2.5W/m · ◦C. The
distance between centers is 5.5 cm. Calculate the heat transfer per unit length between
the cylinders.