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-you take into account air flow inside your device with a cfd code (flow simulation for instance) in order to calculate your heat flow : the "h" coefficient due to convection,
- you simplify this by indicating that natural convection with air is more or less equal to 10W/m².K and select all the faces that are in contact with air...and perform a thermal steady state analysis available in Solidworks Simulation PRO.
Hope it helps.
Sorry I saw the profile avatar and I couldn't resist.