Aiming at the problem of poor cooling effect in the cooling section of hot dip galvanizing alloy furnace, the heat transfer optimization of spray cooling device was carried out by means of numerical simulation. In this paper, the physical and mathematical model of spray cooling system with single nozzle were established and the unsteady atomization field and temperature field of spray area were simulated by using FLUENT software. The distribution law of droplets,droplet velocity and droplet diameter as well as the distribution characteristics of wall temperature were studied. The results showed that the droplet distribution is more uniform, and the droplet velocity is greater in the spray region outside the stagnation point. From the spray center to the edge region, the average diameter of droplets is decreasing. The temperature distribution of the wall is nonlinear and the temperature non-uniformity is decreasing with the increase of time. The results of this study provide a theoretical basis and technical guidance for the specific application of spray cooling.%针对热镀锌合金化炉冷却段冷却效果不佳的问题,采用数值模拟的方法对喷雾冷却装置进行传热优化.建立了单喷嘴喷雾冷却系统的物理模型和数学模型,利用FLUENT软件对喷雾区非稳态雾化场和温度场进行仿真分析,探究不同条件下雾化场液滴的分布、液滴速度和液滴直径的分布规律以及在钢板冷却过程中壁面温度的分布特征.结果表明,在滞止点以外的喷雾区域,液滴的分布更加均匀,并且液滴速度也更大.从喷雾中心区域到边缘区域,液滴的平均直径在不断减小.壁面的温度分布呈非线性变化,随着时间的增加,温度不均匀性减小.本研究所得结论为喷雾冷却的具体应用提供了理论基础和技术指导.
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