What is the thermal conductivity value of graphite in the xy plane? I've seen several papers with different values so is it 100s or 1000s at room T?
you can look at the following paper and references herein:
A. A. Balandin "Thermal properties of graphene and nanostrctured carbon materials, Nature Materials" 10, 569 (2011) DOI: 10.1038/NMAT3064
Theoretical thermal conductivity of graphite crystal at 25 ºC; for ab directions: 398 W/m·K; for the c direction 2.2 W/m·K. Ref.: Hugh O. Pierson, Handbook of Carbon, Graphite, Diamond and Fullerenes ─ Properties, Processing and Applications, Noyes Publications, New Jersey, 1994, p. 54.
I found the value of 168 W/mK for thermal conductivity of Carbon.
The thermal conductivity of graphite depends on the anisotropy of the layers but generally it varies from 25-470 W/Mk.
Dear Kanishka Kobbekaduwa,
The thermal conductivity of graphite depends on the anisotropy of the layers but generally it varies from 25-470 W/Mk.Generally it is “GraphiteTIM(Compressible Type) with thermal conductivity : X-Y direction 390-400W/m∙K, and in Z direction (28W/m∙K).
Why this is different?
However, controlling the orientation of GFs still remains a challenge. The corresponding thermal conductivity is as high as the thermal expansion will be less.
Reason Property
Because of the weak binding and the large lattice spacing in the c-direction, the phonon spectrum of graphite is approximately two-dimensional for frequencies above f c = 4 THz. Thus one can model the a-plane thermal conductivity by a two-dimensional phonon gas. That’s why in XY plane conductivity value is high and it is anisotropic when we compare with Z plane.
Hope it is helpful for you.
Ashish
you can look at the following paper:
A numerical and experimental investigation on the performance of a low-flux direct absorption solar collector (DASC) using graphite, magnetite and silver nanofluids
TB Gorji, AA Ranjbar - Solar Energy, 2016 - Elsevier
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