  A method for the most efficient removal of heat, through an anisotropic
composite, is proposed. It is shown that a rational placement of constituent
materials, in the radial and the azimuthal variation, at a given point in the
composite yields a uniform temperature distribution in spherical diffusers,
accompanied by a very significant reduction of the source temperature, in
principle, to infinitesimally above the ambient temperature, and underlies the
design of a perfect thermal diffuser. Orders of magnitude enhanced performance,
compared to that obtained through the use of a diffuser constituted from a
single material with isotropic thermal conductivity has been observed and the
analytical principles underlying the design were validated through extensive
computational simulations.
