Calculation of heat transfer to a turbulent flow in circular and annular pipes with consideration of the temperature dependence of the thermophysical properties of the coolant

The results of a theoretical calculation of heat transfer to a turbulent gas flow in circular and annular pipes in the case of large thermal heads and various boundary conditions are presented. The values of stabilized Nusselt number for boundary conditions of the second kind constant over the length and perimeter of the inside and outside pipes were obtained for constant properties.