Altair RISE

A program to recognize and reward our most engaged community members

Nominate Yourself Now!

Modelling of the radiative heat transfer in vacuum FLUX

I have a FLUX model with susceptor - piece in a vacuum. The susceptor is inductively heated. I want to realize the modelling of radiative heat transfer in vacuum FLUX, from susceptor to workpiece. I understand that in vacuum is not possible radiative heat transfer.

Find more posts tagged with

English

Flux

Accepted answers

All comments

fzidat

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

Media Marius

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.

SimonGuicheteau

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.

Ovando_RBB

Hi there,

It is possible to model the heat transfer by radiation from susceptor to workpiece with flux. Flux computes the view factor to estimate the amount of radiation heat transfer from the hottest to the coldest body; therefore, you will need to make sure that the boundary of the radiative body and the boundary of the receptive body can "see each other", otherwise the model will not converge.

Make sure you pick "local radiation between radiating regions" at your boundary setup.

Hope this comment helps!