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Step 1: Pre-Analysis
With the current problem setup, we know that the temperature will increase as the air passing through the heated section. Depending on whether the pipe is long enough, we might see uniform temperature at the end of the pipe.
Since the geometry of the pipe is axisymmetric, we can set our domain of interest as rectangular.
Figure above shows the simplified geometry of our problem where R = radius of the pipe, and L = length of the pipe.