Question: Air flows at a velocity u = 1 m / s through a long square duct of inner dimension D as shown in the schematic.

Air flows at a velocity u=1m/s through a long square duct of inner dimension D as shown in the schematic. All four inner surfaces of the duct are fixed at a temperature of 500 K. It is confirmed that there is a parabolic velocity profile in the middle of the pipe. At the middle of the pipe, the average air temperature is 350 K. What is the heat transferred per unit length of pipe?
Air flows at a velocity u = 1 m / s through a

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