The use of power-law kernels in the integral model of non-local thermodynamics yields a fractional model of thermal energy transfer in rigid as well as in elastic bodies [19], [20] and [21] often used to describe thermal energy transfer in nano-systems[22] and [23]. In such cases fractional models aim to capture, also, the well-known second-sound effect [24], [25], [26] and [27] involving also the presence of fractional time derivatives of the temperature field [28] and [29].
In this paper the authors aim to introduce a general framework of non-local thermal energy transport assessing the thermodynamic restriction of the distance-decaying function class for heterogeneous bodies. The choice of the distance decaying function in the class of power-laws, for homogeneous rigid body, yields the temperature equation in terms of the multidimensional Marchaud fractional derivatives assuming that, also the presence of local transport equation is significative in the thermal phenomenon. Analytical solutions as well as numerical results about temperature distributions are conveniently reported in the paper.