METHODOLOGY OF EXPERIMENTAL STUDY OF LOCAL CONDITIONS OF NON-STATIONARY HEAT TRANSFER

The task of studying the conditions of heat exchange of a sprayed liquid – water with different concentrations of surfactants with a high-temperature surface has defined a number of problems that need to be solved. Two tasks: development of means for experimental study of non-stationary local conditions of heat exchange of a high-temperature surface with a sprayed liquid, taking into account the possibility of implementing a change in the level of determining factors in the range corresponding to their real values ​​in full-scale energy and metallurgy facilities, and the task of choosing a method for identifying the boundary conditions of heat exchange, from our point of view, are the main ones. Analysis of scientific publications and our own research have allowed us to establish that the central factor influencing local heat exchange conditions is the local irrigation density, which would be one of the factors for developing effective cooling systems, or for determining the thermal state of an object under various external influences. The next objective of the study is to investigate the intensity of heat exchange as a function of underheating of the sprayed liquid – water with different concentrations of surfactants at different local irrigation densities and surface temperatures. Since we are considering a multifactorial problem, modern requirements of the theory of experimental planning have made it possible to develop a methodology for experimental study of local conditions of non-stationary heat exchange, which will allow us to conduct a study of the boundary conditions of heat exchange as a function of the interrelated influence of the irrigation density, surface temperature, velocity and angle of impingement of the sprayed liquid onto the surface. The measurement technique we have developed will allow us to obtain reliable research results. Solving the inverse problem of heat conduction will allow us to establish the degree of influence of almost all factors noted as determining. It is obvious that in this case, studying the boundary conditions of heat exchange as a function of the speed of movement of a high-temperature surface results in a large independent problem.