The Experiment Research And Analysis On Spray Cooling

The heat transfer mechanism and effect factors of spray cooling were described in this paper, and the study actuality of spray cooling at home and abroad was also introduced and summarized. The CHF conclusion was defined as follows: It could gain the most Critic Heat Flux (CHF) when the circular spray impact area formed by the cone spraying nozzle inscribed in the surface of the square heat source under the same spray characteristics condition. Then on the premise of CHF conclusion, the motion trace of the nozzle was deduced when incline spraying.Based on the spray cooling heat transfer mechanism, the experimental apparatus was designed,processed, and a platform for experiments was built, before heat transfer experiments, the spray characteristics of the nozzle adopted was tested. The results showed that the flow of nozzle was approximate in proportion to the 0.5 power of entrance pressure, and the distribution of the droplet produced by the nozzle was uneven both in radial and circumferential direction, and the spray characteristics are not the same among the three nozzles.The CHF conclusion was verified under the condition of this experiment, and it was revised as follows: it was the best condition when the extrapolated edge of the circular fluid film inscribed in the surface of the square heat source.On the premise of CHF conclusion revised, the heat transfer experiment of incline spray was carried out, the results showed that it would result in the uneven distribution of temperature on the surface of the heat source regardless of inclination spray along the diagonal or one side of the heat source, and in the inclination spray cooling, the flow of the nozzles related to the entrance pressure had a little effect on the heat transfer performance of the whole system. But for each nozzle, the effect of spray angle on heat transfer performance was different both in pattern and in degree. This may be due to the different spray characteristics of the nozzle, and their effects were especially significant during inclination spray.