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Using the above equation, calculate the mixed mean temperature Tm at x=2.67 m. An alternate procedure to calculate Tm is by involves integrating the temperature profile. This procedure is covered in the Verification & Validation section where we check that the values calculated by using the two procedures match. This should be the case if energy is conserved in the FLUENT simulation.

Wall Temperature at an Axial Location

The following video show shows you the procedure for extracting the wall temperature at x=2.67 m. To repeat the calculation at a different axial location, you can right-click on appropriate items in the tree, duplicate and modify as necessary. You need to double-click on an item in the tree to modify it; this is easy to overlook.

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• Export values from your Tw vs. x plot to an Excel file by clicking on the Export button, as previously discussed in the Wall Temperature Plot section. You'll see that the Excel worksheet contains many values of Tw vs. x.  
• Calculate Tm vs. x as discussed above.
• Then calculate Nu directly in the same Excel worksheet from Tw and Tm. 

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