| With the rapid development of science and technology,many fields are faced with the innovation of cooling technology.Spray cooling stands out for its unique advantages and has attracted the attention of scholars at home and abroad.Spray cooling,as a new cooling method,has low requirement for cooling medium,strong heat dissipation ability,and no contact thermal resistance when it comes into contact with solid cooling object.At present,most of the research on spray cooling is focused on the stationary hot wall,and there are few studies on spray cooling of the vertical moving hot wall.Based on the practical engineering application,the physical and mathematical model of vertical motion hot wall spray cooling is established in this paper.First of all,according to the actual engineering,the nozzle spacing was usually constantly adjusted to make the spray droplets overlap in a certain range,so as to achieve the best cooling effect.Taking this as the starting point,the influence of the spray overlap rate on the cooling effect of the hot wall was studied by numerical simulation.The results showed that when the transverse and longitudinal spray overlap rates were 0%,25%,50% and 75% respectively,and when the transverse spray overlap rates were 25%,the spray droplet position distribution,the droplet velocity distribution on the hot wall surface and the temperature distribution on the hot wall surface were the most uniform,and the cooling effect on the hot wall surface was the best.When the longitudinal spray overlap rate was 25%,the surface temperature distribution of the hot wall was the most uniform,and when the longitudinal spray overlap rate was 75%,the cooling speed of the hot wall was the fastest.Secondly,the influence of the velocity of the hot wall on the cooling effect was studied by numerical simulation.The results showed that the surface temperature distribution of the hot wall was more and more uniform with the increase of the velocity of the hot wall;The cooling rate of the hot wall first increased,then decreased,and finally became stable.When the moving speed of the hot wall was 1m/s,the cooling speed of the hot wall was the maximum.Finally,the influence of double nozzle Angle on the cooling effect of the hot wall was studied by numerical simulation.The results showed that when the double nozzle Angle changed from-30° to 30°,and when the double nozzle Angle was 0°,the surface temperature distribution of the hot wall was the most uniform;When the double nozzle Angle was-30°,the cooling speed of the hot wall was the maximum.The results of this study can provide theoretical basis and technical guidance for the application of spray cooling. |
