Specifying radiation for thermal contact property options

From the main menu bar, select InteractionPropertyCreate.
In the Create Interaction Property dialog box that appears, do the following:
- Name the interaction property. For more information about naming objects, see Using basic dialog box components.
- Select the Contact type of interaction property.
Click Continue to close the Create Interaction Property dialog box.
From the menu bar in the contact property editor, select ThermalRadiation.
In the editor that appears, enter values for the emissivity, $ϵ$ , of the main and secondary surfaces.
In the table provided, define the view factor as a function of clearance.
The view factor should have a value between 0.0 and 1.0. At least two pairs of points are required. The tabular data must start at zero clearance (closed gap) and define the view factor as the clearance increases. The value of the view factor drops to zero immediately after the last data point, so there is no radiative heat transfer when the clearance is greater than the value corresponding to the last data point.
Click OK to create the contact property and to exit the Edit Contact Property dialog box. Alternatively, you can select another contact property option to define from the menus in the Edit Contact Property dialog box.