Features of interaction between supply jets and convective flow in heated vertical surfaces of technological equipment

The peculiarities of air distribution in a limited free space under compressed conditions of thermally stressed technological premises require consideration of the interaction of supply jets and convective flows in the heated surfaces of technological equipment. Similar problems of interaction of compact turbulent jets with vertical surfaces also occur in technological equipment. The development of supply jets of various types, which are laid on a flat surface, has been sufficiently studied both theoretically and experimentally since XX century. In addition, there is also a body of experimental research on the interaction of convective flows in vertical heat-dissipating surfaces of equipment with transverse air-jet overlap to minimize temperature stratification along the height of the premises. Analysis of modern developments on this problem showed that there is no data on the thermal and aerodynamic characteristics of the conditions of interaction of compact turbulent jets with vertical heated surfaces of equipment, although as noted above, these issues are relevant for applied problems of aerodynamics and hydraulics. The article presents the results of a comprehensive study of the interaction of a compact turbulent jet with a convective flow formed near a heated vertical surface. Special attention is paid to identifying key factors that determine the intensity of this interaction, in particular: the geometric parameters of the jet, temperature conditions, and properties of the working environment. Experimental studies conducted using modern methods of flow visualization and thermal anemometry allowed us to establish a criterion dependence of the relative level of interaction on the Archimedes number (Ar). This dependence quantitatively characterizes the influence of the conditions of jet flow onto the plate on the processes of heat and mass transfer in the system. The obtained results have important theoretical and applied significance. Based on them, an improved model of flow interaction was developed and the boundary conditions of interaction were established for different values of the Ar criterion. The results of the study may be useful for heat engineers, designers of ventilation systems and developers of technological equipment where similar combined flows occur.