关键词: 喷雾冷却, 膜态沸腾, 喷射方向, 传热系数, 水流密度

Abstract: A spray cooling model was set up taking the impact of spraying droplets as a disturbance due to film boiling in cooling pond, of which the effects of water flow density, droplet size and impact force were taken into account. It was also found that the difference between thickness of water film in different spraying directions is the main influencing factor of spraying direction on the heat-exchange coefficient of continuous-cast ingot surface. The thickness of water film was therefore introduced into the model to analyze the influence of spraying direction on heat-exchange coefficient. The results indicated that the heat-exchange coefficient is maximum if the spraying angle is 90° with ingot surface at low waterflow density and, as a while, the coefficient distribution is symmetrical to the perpendicular spraying direction if the angle is different from 90°. The coefficient will increase greatly with spraying angle if the waterflow density is high. The result, as a theoretical analysis, is much the same with the existing works done in other ways.