Atmospheric air at a temperature of 300 K flows through a short pipe segment as shown in Fig. P4.19. The diameter of the pipe segment is 5 cm, and its length is 2.5 cm. The air mean velocity is 0.06...

Atmospheric air at a temperature of 300 K flows through a short pipe segment as shown in Fig. P4.19. The diameter of the pipe segment is 5 cm, and its length is 2.5 cm. The air mean velocity is 0.06 m/s. The pipe segment’s surface temperature is 450 K.

Calculate the average heat transfer coefficient in two ways: (a) by approximating the flow on the pipe surface as the flow on a flat plate, and (b) by using the correlation of Hausen (1983):

Compare and discuss the results