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<iframe width="640" height="360" src="//www.youtube.com/embed/mv3uDy7ZuCY?rel=0" frameborder="0" allowfullscreen></iframe>

One can also calculate the mixed mean temperature variation from using energy balance which predicts that the mixed mean temperature should grow linearly in the heated section while being constant in the other two sections. If energy is conserved in the simulation, the two methods should yield the same mixed mean temperature. 

Nusselt No.

The following video shows you the procedure for calculating the Nusselt no. at x=2.67 m from the mixed mean and wall temperatures obtained above. To repeat the calculation at a different axial location, you can right-click on appropriate items in the tree, duplicate and modify as necessary.

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