ANALYTICAL SOLVING THE PROBLEM OF HEAT EXCHANGE IN INTENSIVE TURBULENT FLOW IN CHANNELS FOR FOUR-LAYER SCHEME OF TURBULENT BOUNDARY LAYER AT A RELATIVELY LOW TURBOLATORS
In the present paper it was developed a theoretical mathematical model of a multi-layer intensive heat exchange in a turbulent flow in straight circular pipes with surface periodically arranged flow turbolators. The model is based on the four-layer mathematical modeling turbulent boundary layer in the space between turbolators. It was obtained the analytical solutions on intensive heat transfer problem of this type, depending on the pipe dimensions with turbolators and flow regimes of coolant. Previously developed theory correlates with the available empirical data satisfactorily, but it uses the appropriate additional assumptions that restrict its application. The results of calculation, depending on the governing parameters are in good agreement with the available experimental data and have a distinct advantage over the latter, as the assumptions made in deriving them, cover a much wider range of determining parameters than the limits in the experiments. For the presented formulation of the problem, the obtained solutions of equations describing intensive heat exchange in tubes with turbolators can be considered as accurate. These calculated data on the intensive heat exchange in tubes with turbolators correspond to the experimental data more exactly than the existing analytical solutions.