A method of obtaining analytical solutions to boundary value problems based on defining additional boundary conditions and additional desired functions

Using additional boundary conditions and additional unknown functions in the integral method of heat balance, we consider the method of obtaining analytical solutions to the thermal conductivity problem associated with the separation process of thermal conductivity of two phases with respect to time, which allows reducing the solution of partial differential equations to the integration of two ordinary differential equations for some additional desired functions. The first stage is characterized by a rapid convergence of the analytical solution to an exact one. For the second stage, the exact analytical solution has been obtained. Additional boundary conditions for both phases are in such a form that their execution by a desired solution be equivalent to realization of the original equation at boundary points and at a front of the temperature perturbations. It is shown that the implementation of the equations at the boundary points leads to its execution also inside the domain.