Specify Radiation Transparency
Prerequisites
This option is available if the Conduction and Radiation options are selected in the Wizard or General Settings dialog.
Procedure
- On the Solids tab, click Radiation Transparency
button. - In the Radiation Transparency dialog
box select one of the following types of transparency:
Opaque. The solid material is considered as not transparent to any type of radiation available in Flow Simulation.
Absorptive.
The solid material is considered as partially transparent to radiation,
i.e. it absorbs radiation in accordance with the specified absorption coefficient.Restriction:This option is available for the Discrete Ordinates model only, if the Absorption Coefficient is specified in the solid material definition in the Engineering Database and the Absorption in solids option is selected under Radiation in the Wizard or the General Settings dialog.
Note:The Absorption coefficient and Refractive index values are provided under Properties of solid just for reference (their values are specified in the Engineering Database).
The absorption coefficient and the geometrical parameters of a solid body define the amount of the radiation heat absorbed by a solid body. It can be specified as a constant or depending on wavelength.
TipAlso it is possible to assign a Radiative Surface to a surface of an Absorptive solid material (see “Radiative Surfaces” for details).
Transparent. The solid material is considered as fully transparent for radiation, i.e. it does not absorb or reflect any radiation.
Under Transparent to you can select the default solid material to be transparent to Thermal radiation only, Solar and directional radiation only or to both Thermal, directional and solar radiation.
Note:The Refractive index value is provided under Properties of solid just for reference (its value is specified in the Engineering Database).