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Originally Posted by unregistered
I do not believe a 'diffusion coefficient' has any relevance to solids and a liquid medium, and would be the same for cu and ag in any case per your definition (varying porosity)
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Yes it does; for a chemist heat can be treated like a chemical compound with regard to most of the relevant properties. Heat doesn't disappear without a reason (it's mass conservative in this regard), the transport behavior is described by diffusion, dispersion and advection and the absence of equilibrium (by lack of transport) will lead to a heat build up with a higher delta T until a new (flux based) equilibrium has been reached.