Centrifugal atomizer has been widely used to produce metal powders, slag granules through dry slag granulation process. In this process, liquid is poured at the center of the spinning disc, which disintegrates to form droplets, and becomes solid granules/powders on cooling. In this study, a numerical simulation has been carried out to estimate powder size considering phase change into the model, and the obtained results are validated with experimental measurements. Different mechanisms of powder production viz., direct powder formation, ligament to powder formation, and film to powder formation have been captured at various liquid flow rates and angular disc speed. The effect of composition of the model liquid slag and its properties like viscosity, density, surface tension, etc. has been studied using this mathematical model. Further, the effect of superheat on solidification was also considered. Finally, powder size distribution has been correlated with properties of the slag, superheat of the liquid, and process variables.

Graphical Abstract

中文翻译：

---

离心雾化过程中粉末生产的建模

离心雾化器已被广泛用于通过干渣造粒工艺生产金属粉末，矿渣颗粒。在此过程中，将液体倒入纺丝盘的中央，该液体崩解形成液滴，并在冷却后变成固体颗粒/粉末。在这项研究中，已经进行了数值模拟以考虑模型中的相变来估计粉末尺寸，并且所获得的结果通过实验测量得到了验证。在各种液体流速和圆盘角速度下，已经捕获了粉末产生的不同机理，即直接形成粉末，形成粉末的韧带和形成粉末的膜。使用该数学模型研究了模型渣的组成及其粘度，密度，表面张力等特性的影响。更多，还考虑了过热对凝固的影响。最后，粉末的尺寸分布与炉渣的性质，液体的过热以及工艺变量有关。

图形概要