Experimental study of heat transfer during cooling of a high-temperature surface by a water-air spray

This paper presents the results of a study into the cooling efficiency of a target in a test section using a water-air spray under high heat flux conditions that is applicable to solving temperature control problems in the fusion energy, microelectronic, and metallurgical industries. Experimental studies were conducted in the ‘One-Sided Target Heating’ thermophysical test facility at the National Research University “Moscow Power Engineering Institute” (MPEI). In the experiments, the flowrates of the coolant components ranged from 0.5 to 2 l/min for water and from 2 to 100 l/min for air. It is found that this cooling system can remove heat loads as high as 10 MW/m2 from the target at relatively low pressures of the coolant components. The study demonstrates that the examined cooling method can yield heat transfer coefficients of up to 150 kW/(m2·K).