Defining Surface-to-Surface Radiation Behavior at an Inlet

For surface-to-surface radiation model, you can specify parameters such as emissivity, temperature, and participation to radiation, at the opening (inlet and outlet) and wall. Both radiation temperature and emissivity can be defined with a uniform concentration or a concentration that varies according to spatially mapped data.

Before you begin: You must have your spatially mapped data prepared if you want to define any quantitiy with values that vary in space. The mapped data should specify different radiation or emissivity values at various points in space.
Note: When you define the emissivity values using spatially mapped data, you should confirm that the relative fractions add up to 1.0 in every location you specify. The app does not perform this validation.
See Also
About Inlets
In Other Guides
Support Selection
  1. Open the inlet for which you want to specify surface-to-surface radiation behavior.
  2. From the Surface-to-surface radiation options, select one of the following:
    OptionDescription
    On: Use radiation temp Specifies a radiation temperature to be used in the radiative heat flux calculation at this opening. This option is useful when the external temperature that dominates the radiation effects is different from the flow temperature.
    On: Use flow temp Allows the flow temperature to be used in the radiative heat flux calculation at this opening.
    Off Defines an inlet that does not participate in the view factor computation; that is, the inlet is transparent to radiation.
  3. If you selected On: Use radiation temp, specify the radiation temperature at the inlet. You can specify a radiation temperature that is uniform throughout space or one that varies according to a set of mapped spatial data.
  4. If you selected On: Use radiation temp or On: Use flow temp, specify the emissivity. You can define an emissivity value between 0 and 1, and emissivity can be uniform throughout space or one that varies according to a set of mapped spatial data.
  5. Click OK in the dialog box.