Grey Diffusive Radiation - Boundary Condition

Grey Diffusive Radiation establishes a grey-diffuse scenario for radiation intensity, \(I\), to be used with the finite-volume discrete-ordinates model (fvDOM). The radiation temperature is derived from the boundary condition of the temperature field.

"Grey" means radiation properties are independent of wavelength, and "diffuse" indicates uniform distribution across all angles. This condition handles the interplay of radiative and convective heat transfer at surfaces, crucial for high-temperature applications where both modes are significant.

The Grey Diffusive Radiation boundary condition assumes grey-body radiation (wavelength-independent) and diffuse emission/reflection. It integrates radiative intensity with convective heat transfer, deriving radiation temperature from the temperature field boundary condition.

This allows for accurate modeling of heat transfer in environments where both radiation and convection are important, such as high-temperature furnaces or electronic cooling.

The Grey Diffusive Radiation is used in simulations requiring detailed radiative transfer with the fvDOM model, where grey and diffuse assumptions are valid.

To define the Grey Diffusive Radiation boundary condition in SimFlow, radiation must be enabled and the Discrete Ordinates (fvDOM) model selected. Navigate to the Boundary Conditions panel, select the appropriate boundary, and choose Grey Diffusive Radiation from the drop-down menu.

Define the surface properties: emissivity, absorptivity, and transmissivity.

In this section, we propose boundary conditions that are alternative to Grey Diffusive Radiation. While they may fulfill similar purposes, they might be better suited for a specific application and provide a better approximation of physical world conditions.