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In ANSYS version 14.5 and later, only one half of the pipe cross-section is displayed after using the mirroring option. You can work around this by applying the mirroring condition in the "Default transform" setting and not in the "View" Tab. To do this select "Default Transform" in the left-hand menu, uncheck "Instancing Info from Domain", check "Apply Reflection" and select to mirror about the ZX Plane.
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To find the temperature at the wall, click on insert >> location >> point, and name it Tw exit. In the Details of Tw exit window, set Method to XYZ and enter (8.64, 0.06, 0) in Point.Click Apply to create a point at the upper right corner of the pipe.
Click on Expression right below 
and right click in the window to create a new expression named Tw. Under Details of Tw panel, enter probe maxVal(Temperature)@Tw exit in the Definition tab.
Tw now gives the temperature at the location (8.64, 0.06, 0), which is on the exit pipe wall.
Mixed Mean Temperature
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We are now ready to find the Nusselt Number. Create another expression and name it Nu exitexp. Under the Definition tab, enter the Nusselt Number expression shown in the equation above. The units are entered in square brackets, this is done to ensure the expression for the Nusselt Number is dimensionless.
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We would like to compare the Nusselt Number along the heated section of the pipe. We can generate the Nusselt Number at a different location by simply changing the x-coordinate of exit and Tw exit, which we defined earlier. Once the new coordinates defined in exit and Tw exit are updated, the associated expression Tw, Tm, and Nu exit will exp will be updated automatically.
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