  Using numerical methods, we systematically study in the framework of ideal
MHD the effect of magnetic fields on heat transfer within a turbulent gas. We
measure the rates of passive scalar diffusion within magnetized fluids and make
the comparisons a) between MHD and hydro simulations, b) between different MHD
runs with different values of the external magnetic field (up to the energy
equipartition value), c) between thermal conductivities parallel and
perpendicular to magnetic field. We do not find apparent suppression of
diffusion rates by the presence of magnetic fields, which implies that magnetic
fields do not suppress heat diffusion by turbulent motions.
