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This expression will now give the mean temperature at the location in which we called "exit". Recall the pipe radius r is defined in the Y direction in FLUENT. Hence we will use Y to define the radial position in the pipe, as shown in the expression above.

We are now ready to find the Nusselt Number. Create another expression and name it Nu exit. Under the Definition tab, enter the Nusselt Number expression shown in the equation above:

37.52*2*0.06m/(0.02W/m/K*(Tw-Tm))

The units are entered in square brackets, this is done to ensure the expression for the Nusselt Number is dimensionless.
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To export the data, click on the "export" button.  Comma Seperated Value (.csv) is able to be read by matlab and Excel, so it should be fine.

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