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Well, that's great, I just can't get past this one, can I? "Mainz/Frankfurt. Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz and the National University of Singapore have attested that the thermal conductivity of graphene diverges with the size of the samples. This...

Thanks, everybody. IRstuff, for the record I'd like to say I'm not actually criticizing Fourier. I've told people the concept of thermal conductivity can be used to predict heat transfer through materials that are thicker than mean free path scale, if they practically opaque to thermal...

Here are citations that doubt Fourier's law (to oversimplify a bit): http://www.qats.com/cms/2011/10/21/thermal-conductivity-what-is-it-and-why-you-should-care/ This describes small length scale deviation from Fourier's law, saying "In the electronics industry, the constant push for smaller...

OK, thank you moltenmetal, we have a couple encouraging leads here! >Porous insulating materials, and materials in composite, are notoriously hard to thermally model because contact resistance is a very tricky parameter to quantify with any accuracy. We actually had a discussion about this...

>No, you are confusing R-value and thermal conductivity (rho). R-value is the thermal conductance of a fixed thickness of insulation. Thermal conductivity is ALWAYS in terms of W/m-K, which thermal conductance is rho/thickness, resulting in W/m^2 of thermal conductance. Thanks, but that isn't...

A few vague references out there say you can't just state a thermal conductivity for a bulk material, for example insulation used in building construction, because it depends on thickness. Anybody know what this is getting at? Trivially, packing a flexible insulation into a smaller volume spoils...