Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
Heat conductivity problem in rectangular region is studied numerically with algorithm describing in . The region is divided into two equal parts. Boundary conditions have harmonic variation in time and are the same on the left and on the right sides. Heat conduction is assumed to behave as various linear functions of temperature on the left and on the right half of region. Heat conduction is an increasing function of temperature in the one part and is a decreasing function of temperature in the other part. It is found that heat transfer is not equal zero through the region for period. Similar effects for periodic natural convection were investigated in the works , . It is also obtained that total heat flux for period through the region depends on its length.