Physical and Theoretical Models of Heat Pollution Applied to Cramped Conditions Welding Taking into Account the Different Types of Heat

• Published in: IOP conference series. Earth and environmental science Vol. 66; no. 1; pp. 12015 - 12020
• Main Authors: Bulygin, Y I, Koronchik, D A, Legkonogikh, A N, Zharkova, M G, Azimova, N N
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2017
• Subjects: Adequacy; Aerodynamics; Air flow; Air temperature; Body temperature; Computational fluid dynamics; Confined spaces; Density distribution; Field tests; Flow velocity; Heat; Heat exchange; Heat transfer; High temperature; K-epsilon turbulence model; Mass transfer; Mathematical models; Pollution sources; Process parameters; Qualitative analysis; Radiation; Thermal stress; Turbulence models; Welding; Workstations
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/66/1/012015

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.