Modelling of the radiative heat transfer in vacuum FLUX
Answers
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Hello;
From the Flux help you can find some information on the radiation. Radiation and convection are actually boundary condition of your Thermal Flux project. In Flux we are studying only thermal conduction.
However, you can define radiation on faces if you are in 3D or on lines if you are in 2D.
Regards
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Hello
In my FLUX model with susceptor - piece in a vacuum, I considered line region models the thermal radiation exchanges between the susceptor and piece (perimeter lines). It is defined only by a constant value of the radiation exchange coefficient. But it does not work, the thermal radiation exchanges in vacuum between the susceptor and piece do not exist.
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Hello,
You can have a look at the radiation example from the supervisor. You need to define both interacting surfaces/lines as "local radiating surfaces". Local radiation takes more time to compute than radiation to the infinite as it needs to compute viewing factors between each radiating elements. Make sure you don't define it on the whole model with a tiny mesh.
FYI Ideally this is used as an internal radiation. Make sure the model is a closed thermal system. For instance, if you only have one part radiating with nothing to receive, the energy is just numerically radiated leading to negative temperatures in K. So to avoid that, make sure the radiation is contained within something, or you can also close the outer domain with a fixed temperature and a local radiation as well to receive the heat.
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