Heat transfer in a medium in which many small particles are embedded

The heat equation is considered in the complex system consisting of many small bodies (particles) embedded in a given material. On the surfaces of the small bodies a Newton-type boundary condition is imposed. An equation for the limiting field is derived when the characteristic size $a$ of the small bodies tends to zero, their total number $\mathcal{N}(a)$ tends to infinity at a suitable rate, and the distance $d=d(a)$ between neighboring small bodies tends to zero $a<<d$. No periodicity is assumed about the distribution of the small bodies.