Air is flowing at a rate of 10 lb/h inside a round tube with a diameter of 1.5 in. and length of 10 in., similar to Figure 13-32 on page 645. The initial temperature of the air entering the tube is 508F. The wall of the tube has a uniform constant temperature of 200°F. The specific heat of the air is 0.24 Btu / (lb-oF), the convection coefficient between the air and the inner wall of the tube is 3.0 Btu / h-ft2 -oF), and the thermal conductivity is 0.017 Btu h-ft-oF). Determine the temperature of the air along the length of the tube and the heat flow at the inlet and outlet of the tube?

Figure 13-32 Air flowing through a tube, and the finite element model

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Twall = T. (3) S in. T= 100°F