COMSOL plot of thermal radiation from heated surfaces -- Help please

In summary, the conversation discusses the use of an electron beam to heat the surface of a material and the need to calculate the amount of heat released and create a graph of dependence. The question is asked about which modules in COMSOL can be used for this purpose. It is mentioned that a previous article on modeling emissivity in radiative heat transfer was not helpful as the radiation in question is thermal spectra emitted by heated bodies.
  • #1
Engineer_Kosyakova
4
1
Homework Statement
Is it possible in COMSOL to plot graphs of thermal radiation from heated surfaces? If yes, is it possible to do this when using the "heat transfer in solids" module, or is it necessary to connect additional modules? Thank you in advance!
Relevant Equations
How is it possible to plot thermal radiation graphs in COMSOL?
There is heating of the surface of the material using an electron beam. It is necessary to calculate how much heat will be released and build a graph of dependence. Please tell me how this can be done, which modules in COMSOL can be used?Thank you!
 
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  • #3
DrClaude said:
This might be helpful: Modeling Emissivity in Radiative Heat Transfer
Thank you for your reply! We have already studied this article earlier, but it does not give us the right answer. The radiation we are interested in is rather thermal spectra. They are emitted by bodies having a temperature greater than 0 K, that is, by different heated bodies, which is why it is called thermal.
 

FAQ: COMSOL plot of thermal radiation from heated surfaces -- Help please

How do I set up a thermal radiation model in COMSOL?

To set up a thermal radiation model in COMSOL, start by selecting the appropriate physics interface, such as Heat Transfer in Solids. Then, enable surface-to-surface radiation in the heat transfer settings. Define the material properties, boundary conditions, and radiation parameters like emissivity and ambient temperature. Finally, mesh the geometry and solve the model.

How can I define the emissivity of a surface in COMSOL?

In COMSOL, you can define the emissivity of a surface by going to the boundary conditions for the heat transfer interface. Select the boundary where you want to apply the emissivity, then specify the emissivity value in the surface-to-surface radiation settings. Emissivity values range from 0 to 1, where 1 represents a perfect blackbody.

How do I visualize thermal radiation in the results?

To visualize thermal radiation in COMSOL, go to the Results section after solving the model. Create a new plot group, such as a Surface plot. Choose the appropriate temperature or radiative flux variable from the dataset. Customize the plot settings to highlight areas of interest, and use color scales to represent temperature gradients or radiative heat flux.

What are common issues when simulating thermal radiation in COMSOL?

Common issues when simulating thermal radiation in COMSOL include incorrect boundary conditions, improper emissivity values, insufficient mesh resolution, and convergence problems during the solution process. Ensure that all material properties and boundary conditions are correctly defined, and consider refining the mesh or adjusting solver settings if convergence issues occur.

Can I include multiple surfaces with different emissivities in a single model?

Yes, you can include multiple surfaces with different emissivities in a single COMSOL model. Define each surface separately in the boundary conditions, and specify the corresponding emissivity for each surface. This allows you to accurately simulate the thermal radiation interactions between surfaces with varying radiative properties.

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