Analysis of the Effectiveness of Cooling a High-Temperature Surface with a Dispersed Coolant Flow

The results of practical work on cooling heated targets of research modules of various designs with a dispersed coolant flow are presented. A brief description of the experimental stand and its main systems, nozzle designs and modules are given, allowing for the implementation of different cooling schemes: with parallel and perpendicular arrangement of the nozzle end and the target surface. Temperature fields of heated targets were obtained depending on thermal loads and water and air flow rates. Primary processing of experimental data was carried out, during which the temperature values on the heating and cooling surfaces were determined. Graphs of the dependence of the temperatures of these surfaces on the supplied thermal power for research modules of various designs are shown. The heat-flux density from the cooled surface of the heated target to the dispersed coolant flow and the heat-transfer coefficient were estimated. The dependences of the heat-flux density and heat-transfer coefficient on the temperature difference between the wall and liquid for different designs of cooling systems are shown graphically. An assessment was made of the proportion of heat removed from the heat-loaded elements of the proposed structures through a phase transition. It is shown that the mutual orientation of the nozzle and the heated surface significantly affects the limiting value of the heat-flux density removed from the target in the thermal stabilization mode. It has been established that the cooling efficiency of a dispersed coolant flow with a perpendicular arrangement of the nozzle end and the target surface depends to a large extent on the timely opening of the spray plume, determined mainly by the operating parameters and the distance from the nozzle end to the target.