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Since we are going to manually specify meshing type and element size, we should turn off ANSYS build-in advanced sizing function. Under Details of "Mesh", expand Sizing, select Off next to Use Advanced Size Function.

https://confluence.cornell.edu/download/attachments/111221571/turn+off+advanced+size.gif

Meshing Method

We would also like to create a structured mesh where the opposite edges correspond with each other. Let's insert a Mapped Face mesh.  Under Outline, right click on Mesh, move cursor to Insert, and select Mapped Face Meshing. Alternatively, you can click on Mesh Control on the third menu and select Mapped Face Meshing. Finally select the pipe surface body in the Graphics window and click Apply next to Geometry.

https://confluence.cornell.edu/download/attachments/111221571/Mapped+Face.gif

Edge Sizing

Now let us move on to specify the element sizing along the pipe radial direction.
Outline > Mesh > Insert > Sizing
In the Graphics window, select both the left and right edge of the geometry (click on the Edge tab on the Fluid flow Fluent - Mesh window and then press Ctrl + mouse click to multiple select). Under Details of "Edge Sizing", click Apply next to Geometry. Change the edge sizing definition Type to Number of Divisions. Enter 30 for Number of Divisions. Next to Behaviour, change Soft to Hard (This is to overwrite the sizing function employed by ANSYS Mesher. Try meshing with soft behavior and see what you get). 

https://confluence.cornell.edu/download/attachments/111221571/Radial+Sizing.gif

Now continue with the sizing in the axial direction.

Outline > Mesh > Insert > Sizing
In the Graphics window, select all the top and bottom edge of the geometry (press Ctrl + mouse click to multiple select). Under Details of "Edge Sizing", click Apply next to Geometry. Enter 0.03 for Element Size (this will give us roughly 200 divisions). Next to Behaviour, change Soft to Hard (This is to overwrite the sizing function employed by ANSYS Mesher. Try meshing with soft behavior and see what you get).

https://confluence.cornell.edu/download/attachments/111221571/Axial+Sizing.gif

We have specified all the meshing conditions. Click Update on the third menu to see the mesh.

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Next, we will name the edges accordingly so that we can specify the appropriate boundary conditions in the later step. We know the bottom edges of the geometry are the centerline of the pipe, the left edge is the inlet of the pipe, the right edge is the outlet of the pipe, top side edges are the unheated wall sections and the top middle edge is the heated wall section. Let's name the edges according to the diagram below. Remember to click on the Edge tab on the Fluid flow Fluent - Mesh window and  icon and then press Ctrl + mouse click to multiple select the 3 line sections that make up the center line before naming it.

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