Fig. 8. Temperature isosurfaces for randomly oriented CNTs (10% wt) showing local different temperatures depending on local different amount of nanotubes after the application of a potential difference of 1 V. Different temperatures are represented with colors from red (hotter regions, larger CNTs content) to blue (poor CNTs content). Panel (A) – the system is shown at the beginning of the simulation, performed by using a thermal diffusivity coefficient of 0.167 nm² ps⁻¹ (left) and 66 nm² ps⁻¹ (right). Panel (B) – the system is shown after 10.5 ns in which the heat diffusion has been simulated by using the same thermal diffusivity coefficients (0.167 nm² ps⁻¹ (left) and 66 nm² ps⁻¹ (right), respectively). A grid of 3.77 nm is employed in this case.