Modeling the Dynamics of Heat and Mass Transfer Processes in a Tubular Heat Exchanger Under Pulsed Influences

Abstract

The paper discusses the results of experimental studies of the influence of the degree of inhomogeneity of a liquid flow on the dynamics of heat and mass transfer processes under pulsed impacts. High-voltage electric discharges in a liquid medium were used as impulse actions, through which an electro-hydraulic effect is realized, accompanied by the appearance of shock waves. The dynamics ofthe occurring nonlinear, rapidly changing heat and mass transfer processes at high hydraulic pressures cannot be described using differential equations. The simulation was carried out on the basis of the method of group consideration of arguments, the advantage of which is the construction of polynomial dependencies using a small amount of experimental data. The results of constructing polynomial dependences made it possible to reveal the synergistic effect of the influence of flow parameters on the dynamics of the impulse pressure amplitude and the intensity of heat transfer.

Analysis of the Heat Exchanger Energy Efficiency of Variable Cross Section with an Inhomogeneous Coolant

“…The principle of constructing the calculation algorithm and the meth-odology for choosing a criterion to ensure the quality and accuracy of the model are described in [18]. It is shown in [19] that, if all conditions are maintained, the presence of a narrowing or expansion of the tubular channel leads to a significant restructuring of the nature of the flow in the initial section of the pipe, which in turn determines the intensity of heat transfer along the entire length. As a result of the regression analysis of the data, the following calculation formula for the heat transfer coefficient was obtained:…”