Abstract. The standard k-epsilon turbulence model, adapted for welding workshops, equipped with fixed workstations with sources of pollution took into account only the convective component of heat transfer, which is quite reasonable for large-volume rooms (with low density distribution of sources of pollution) especially the results of model calculations taking into account only the convective component correlated well with experimental data. For the purposes of this study, when we are dealing with a small confined space where necessary to take account of the body heated to a high temperature (for welding), located next to each other as additional sources of heat, it can no longer be neglected radiative heat exchange. In the task -to experimentally investigate the various types of heat transfer in a limited closed space for welding and behavior of a mathematical model, describing the contribution of the various components of the heat exchange, including radiation, influencing the formation of fields of concentration, temperature, air movement and thermal stress in the test environment.Conducted field experiments to model cubic body, allowing you to configure and debug the model of heat and mass transfer processes with the help of the developed approaches, comparing the measurement results of air flow velocity and temperature with the calculated data showed qualitative and quantitative agreement between process parameters, that is an indicator of the adequacy of heat and mass transfer model.

Patterns of velocity and pressure field formation inside the cyclone apparatus have been revealed. Also, the standard k-turbulence model for the study of aerodynamic processes in centrifugal dust collectors has been adapted A high degree of adequacy of the results is shown. Using the proposed model, taking into account vortex air flow processes forming the velocity and pressure fields in the body of cyclone apparatuses are described.

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Донской государственный технический университет, г. Ростов-на-Дону, Российская Федерация Methodology and principles of searching solutions to ensure safe operation of welders in confined spaces and hard-to-reach places *** Ключевые слова: тепломассоперенос, моделирование, вредные вещества, безопасность, сварка под водой.