Heat Radiation with PERMAS

PERMAS Technology
Heat Radiation shown on a light bulb
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Thermal radiation heat exchange is important at higher temperatures for
models with cavities and self-shadowing of different surface parts, like
in combustion engines, heat sinks and disc brakes.In contrast to conduction
and convection where a physical medium must be present, radiative energy passes
perfectly through a vacuum.
Light bulb example:
A heat flow is applied to the filament of a light bulb which radiates to the
glass envelope. Then heat transport occurs to the environmental air through
radiation and convection.
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The first 60 seconds after switch on as transient heating process of the light bulb is shown.
The graph shows the current temperature of the hot spot.
Temperature state is shown by color (from blue for cold over green to red for hot).
The postprocessor VisPER makes it possible to show the result color on the glass transparent and
on all other surfaces opaque.
There was no mesh required for the vacuum!
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Summary
Radiation characteristics in PERMAS:
Direct Integration over surface elements instead of averaged view factors,
No mesh between radiation surfaces required,
Computational efficiency by parallel data structures, and
Coupled solution of the nonlinear heat transfer equation with radiation
boundary conditions for steady state and transient analysis.
Complete feature set for nonlinear heat transfer analysis available.
Integrated solution:
Coupling with mechanical analysis, electro- & magneto-statics and electrodynamics,
Many optimization methods available.
Thank you Roland for the nice light bulb example!

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