Radiation Shield, Downside (Surface-to-Surface Radiation Interface)
This node defines the shield type and radiative properties on the downside of the Radiation Shield (Surface-to-Surface Radiation Interface) parent node. Depending on the shield type, this feature computes the innermost temperature of the shield and the heat flux between the boundary and the shield if the shield consists of only one layer, as well as the outermost temperature of the shield and the heat flux across the shield if it consists of multilayer. These temperatures are calculated in order to reach the equilibrium between the heat flux between the downside of the boundary and the shield and all heat fluxes involved on the outermost side of the shield. The heat fluxes involved inside the shield are assumed to be all radiative.
This condition can only be applied on boundaries that radiate on the downside. See Diffuse Surface (Surface-to-Surface Radiation Interface) to define the radiation direction.
In order to calculate the heat flux between the boundary and the shield, the emissivity on the downside of the boundary under the radiation shield is required. This emissivity is defined by the Diffuse Surface (Surface-to-Surface Radiation Interface) or Opaque Surface (Surface-to-Surface Radiation Interface) node with which the radiation shield is used. When combined with a Opaque Surface feature, its Directional emissivity function is not considered and thus must be set to Zero.
Fractional Emissive Power
These settings are the same as for the Diffuse Surface (Surface-to-Surface Radiation Interface) node.
Initial values
These settings are the same as for the Radiation Shield, Upside (Surface-to-Surface Radiation Interface) node.
Shield Settings
These settings are the same as for the Radiation Shield, Upside (Surface-to-Surface Radiation Interface) node.
Layer Radiative Properties
These settings are the same as for the Radiation Shield, Upside (Surface-to-Surface Radiation Interface) node.
Inconsistent Stabilization
These settings are the same as for the Radiation Shield, Upside (Surface-to-Surface Radiation Interface) node.
To define temperature dependencies for the user inputs, use the rad.Tshieldd if the Shield type is set to Single-layer insulation, and rad.Tshield_od or rad.Tshield_id if the Shield type is set to Multilayer insulation to refer to the outermost or innermost temperature of the shield respectively.