3. A copper tube has a 2 cm inside diameter and a wall thickness of 1.5 mm. Over the tube is an aluminum sleeve of 1.5 mm thickness having 100 pin fins per centimeter length. The pin fins are 1.5 mm in diameter and are 4 cm long. The fluid inside the tube is at 100oC, and the inside heat transfer coefficient is 5000 W/m2 K. The fluid outside the tube is at 240oC, and the heat transfer coefficient on the outer surface is 7 W/m2 K. Calculate the heat transfer per meter length of tube. Aluminum thermal conductivity is 204 W/m K.