[Natasha3]

Hello!

System: I am simulating a Joule heated wire that has a thin film on the surface. The wire-film structure is inside of a cylinder in which there is a flow of H2 (Re<200). The cylinder is exposed to natural convection (HTC = 10)

Problem statement: I successfully simulated heat transfer through conduction and convection and now I am trying to include the radiation heat loss from the coil, and heat absorbed by film and H2 gas.

Question: Should I simulate the radiation from wire and catalyst as surface to surface MC and fluid (H2 gas) as participating media? I also want to assume that the overall radiation heat loss is just dissipated to environment.

Thank you so much

[ghorrocks]

If the radiation is just from your body to infinity then you can apply a boundary condition to the walls which applies the Stefan-Boltzmann equation. This only applies if radiation transfer between surfaces is insignificant. You do this by defining your own wall heat flux as a CEL expression.

If the radiation is between surfaces and to infinity but the fluid is optically transparent then you need a radiation model, and the Discrete Transfer one is the one to go for.

If there is complex radiation effects occurring, either the fluid has some opacity, reflections/refractions are important or the radiation wavelengths are important then you need the Monte Carlo radiation model. This is the most complex radiation model and can model complex radiation effects but will slow your simulation down a lot.