Study On Heat Transfer Performance Of Spray Cooling And Its Application In Rotary Cooler

Spray cooling is a new cooling method. It has lots of advantages which gets it a lot of attention, such as high efficiency, cooling evenly, extensive applicability and coolant saving et al. Especially in electronics industry, with the temperature of electronic device rising fast spray cooling as the next-generation cooling method becomes a hotspot at home and abroad. This paper based on previous studies will do a research on spray cooling flat plate and rotary cooler.To flat plate cooling, a three-dimension spray-cooling model was generated and the characteristics of heat transfer were studied through simulation. A new correlation of heat transfer was attained. The results show that the heat transfer model will change as spray height and heat exchange area change, and piecewise function happens; with surface temperature heating up, the occupancy rate of phase transformation in total heat lines with the temperature of the heat transfer area.Dozens of experiments were conducted to study cooling rotary cooler. The temperature distribution of exterior wall and material’s heat flux were tested under different heater temperature, spray flow rate and rotation speed. Because of the large thermal resistance between the heater and exterior surface, the temperature of exterior surface is much lower than the heater. Raising material temperature, the temperature and heat flux of exterior surface goes up significantly; Rotation speed has little influence on external surface temperature, but the faster the speed, the more uniform the temperature; Increasing spray flow rate will enhance heat transfer but growth rate will go down gradually.This paper also did a research on spray position, dip angle and material of cylinder body by simulation. The distribution of surface temperature and spray liquid film could be seen visually. The results show that the position of nozzle is very important in cooling process; when the nozzle right above the cooler the liquid film is of most uniform and highest efficiency; because of gravity affects slope angle would worsen the film uniformity and decrease heat transfer; when the thermal conductivity of cylinder body is high, rotation has an appreciable effect on wall temperature which decreases as conductivity becoming worse.