Now one of the most important factors of social and economic development of Russia is education that is dictated by shortcoming of competent professionals of the corresponding profile of society. Improvement of quality of training of students in the system of technical education in general and in the field of energy saving plays not the last role in strengthening of intellectual potential of the country. For increase in motivation of students several methods and the technician allowing to increase considerably the level of interest of students subject and field of activity have been analyzed and offered.

No abstract

Based on the conjugate DarcyBrinkmanForchheymer hydrodynamic model and Schumann thermal model with boundary conditions of the second kind, a model with lumped parameters was proposed by means of geometric 2D averaging to identify the integral kinetics of the temperature elds of a porous matrix and a Newtonian coolant without phase transitions. The model was adapted for a heat-stressed surface by means of a porous compact heat exchanger with uniform porosity and permeability, obeying the modied KozenyCarman relation, in the form of a Cauchy problem, the solution of which was obtained in the nal analytical representation for the average volume temperatures of the coolant and the porous matrix. The possibility of harmonic damped oscillations of the temperature elds and the absence of coolant overheating in the starting condition of the cooling system were shown. For the dimensionless time of establishing the stationary functioning of the porous heat exchanger, an approximate estimate was obtained correlating with the known data of computational and full-scale experiments. Keywords: at porous heat exchanger; heat-stressed surface; boundary conditions of the second kind; time to settle a stationary warm regime.

In this paper, we consider measures to reduce the amount of deposits in heat exchange tubes and increase the intensity of heat exchange through the use of annular notches-turbulators in tubes of shell-and-tube heat exchangers.

In the three-dimensional statement, we consider the Brinkman equation together with the equation of heterogeneous heat transfer for an unidirectional ow of the Newtonian uid under laminar regime through horizontal porous channel having a constant rectangular cross-section with known thermal ows at the boundary and small values of the Darcy numbers. Due to the linearity of the formulated system of model equations, we obtain analytical solution of the system using the Laplace and Fourier integral transformation. The obtained solution allows to estimate the length of the input hydrodynamic section, the coecient of hydraulic resistance, and the local Nusselt numbers. The results obtained for the hydrodynamic subproblem with a large porosity and thermal subproblem with a stationary temperature eld agree with the classical data.