Abstract The dynamic morphologies of a molten blast furnace slag droplet impacting a quartz glass surface are studied visually for a wide range of dimensionless initial temperatures (1.604–1.951), Reynolds numbers (17.4–124.4), and Weber numbers (197–1191). Five morphological evolution modes are defined based on the final stage of the slag film as deposition, receding, prompt-splashing, retraction-deposition and retraction-splashing. An impact regime map is established with the Reynolds number and dimensionless initial temperatures as the coordinates and six boundaries dividing the different modes are identified in the regime map. The apparent temperature nephograms of the slag film are extracted by a home-developed optical calibration method. The dynamic spreading processes and temperature distributions of the different regimes are not simply determined by the initial impact parameters, the coupling effect of the flow of the high-viscosity liquid slag and the heat transfer at the interface will obstruct the consecutive morphological evolution. The regulation principle for the centrifugal granulation system is promoted based on the analysis on an energy barrier for the sufficient spreading of the droplet and the impact regime map.

中文翻译：

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高炉熔渣液滴撞击固体表面的动力学行为和状态图

摘要 对大范围的无量纲初始温度 (1.604–1.951)、雷诺数 (17.4–124.4) 和韦伯数 (197–1191) 的熔融高炉炉渣液滴撞击石英玻璃表面的动态形态进行了视觉研究。根据渣膜的最终阶段定义了五种形态演化模式，分别为沉积、后退、迅速喷溅、回缩沉积和回缩喷溅。使用雷诺数和无量纲初始温度建立撞击状态图，因为在状态图中确定了划分不同模式的坐标和六个边界。渣膜的表观温度云图是通过自主开发的光学校准方法提取的。不同状态的动态扩散过程和温度分布并不是简单地由初始冲击参数决定的，高粘度液态渣的流动和界面处的传热的耦合效应会阻碍连续的形态演化。离心造粒系统的调节原理是基于对液滴充分扩散的能量屏障和撞击状态图的分析而提出的。