Materials
Heat Sink Walls
1
In the Material toolbar, click Blank Material .
2
In the Settings window for Material, type Heat sink walls in the Label text field.
3
Locate the Geometric Entity Selection section. From the Geometric entity level list and choose Boundary.
4
From the Selection list, choose Exterior boundaries without heat sink base (Heat Sink - Straight Fins 1).
5
Locate the Material Contents section. In the table, define the Surface Emissivity equal to 0.9.
Channel Walls
1
In the Material toolbar click Blank Material .
2
In the Settings window for Material, type Channel walls in the Label text field.
3
Locate the Geometric Entity Selection section. From the Geometric entity level list, choose Boundary.
4
In the Graphics toolbar, click next to the View Unhidden  button, then choose View all .
5
Select Boundaries 1, 3, 4, and 44, which correspond to the channel walls.
6
In the Graphics toolbar, click next to the View all  button and select View Unhidden .
7
In the table that defines the Surface emissivity enter 0.85.