Emissivity’s dependence on thickness?
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Hello,
I'm completely new to CFD and would like to ask some entry-level questions: In some flow simulation softwares they usually requires specifying emissivity for surfaces, such as in Solidworks Flow Simulation this might appear as: http://www.cfd-online.com/Forums/att...emissivity.jpg but there is a question on the exact definition for this: it ϵ thickness-dependent? According to http://en.wikipedia.org/wiki/Emissivity: Although it is common to discuss the "emissivity of a material" (such as the emissivity of highly polished silver), the emissivity of a material does in general depend on its thickness. The emissivities quoted for materials are for samples of infinite thickness (which, in practice, means samples which are optically thick) — thinner samples of material will have reduced emissivity.I wonder in doing the calculations, does Solidworks (and other more sophisticated software) make any adjustment according to the actual thickness of a surface? Jerry |
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