On the matrix method for solving heat conduction problems in a multilayer medium in the presence of phase transitions

The work is devoted to the applicability of the matrix method for solving the heat equation for multilayer media in the case where a phase transition is possible in some layer. We consider only stationary processes in the absence of internal heat sources. We propose a general method for layer systems with translation, axial, or central symmetry by using the technique of generalized Bers degrees. By the method indicated above, we perform calculations for one substance, when after a phase transition, the system becomes a two-layer system. We consider the dependence of the coordinate of the phase-transition point on the external temperature and compare results obtained for media with types of symmetry indicated above. A temperature field is constructed for multilayer media with various types of symmetry when a phase transition has occurred in a certain layer.