High-speed Video Image Analysis of Liquid Metal Atomization Process

IF 1 4区工程技术 Q4 ENGINEERING, CHEMICAL

Atomization and Sprays Pub Date : 2024-04-01 DOI:10.1615/atomizspr.2024050511

Alexander Ariyoshi Zerwas, Kerstin Avila, José Luis de Paiva, Roberto Guardani, Lydia Achelis, Udo Fritsching

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引用次数: 0

Abstract

Gas assisted atomization is typically used to produce metal powders for additive manufacturing. In these systems the primary atomization governs the powder size distribution, but it is experimentally challenging to investigate. In this study the primary atomization of a molten metal spray was monitored with a calibrated high-speed camera and digital image processing. The technique enabled the generation of spatio-temporal maps at different distances from the nozzle. Among the characteristics of the spray, mean values and standard deviation of the spray width along the spraying direction, and the frequency of the oscillation of the spray boundaries are presented. Statistically relevant spray asymmetries were identified, which can be caused by faulty spray operation in form of a localized metal solidification at the pouring nozzle. By systematically varying the gas temperature and the gas atomization pressure, it is shown that heating of the gas up to 573 K stabilizes the spraying process and enhances the liquid dispersion in the recirculation zone.

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液态金属雾化过程的高速视频图像分析

气体辅助雾化通常用于生产增材制造所需的金属粉末。在这些系统中，一次雾化控制着粉末的粒度分布，但要对其进行研究在实验上具有挑战性。在这项研究中，使用校准过的高速相机和数字图像处理技术对熔融金属喷雾的一次雾化进行了监测。该技术能够生成距离喷嘴不同距离的时空图。在喷雾特征中，介绍了沿喷射方向喷雾宽度的平均值和标准偏差，以及喷雾边界的振荡频率。研究发现了与统计相关的喷雾不对称现象，这种现象可能是由于浇注喷嘴处的局部金属凝固而导致的错误喷雾操作造成的。通过系统地改变气体温度和气体雾化压力，结果表明将气体加热到 573 K 可以稳定喷雾过程，并增强再循环区的液体分散。

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来源期刊

Atomization and Sprays 工程技术-材料科学：综合

CiteScore

2.10

自引率

16.70%

发文量

审稿时长

1.7 months

期刊介绍： The application and utilization of sprays is not new, and in modern society, it is extensive enough that almost every industry and household uses some form of sprays. What is new is an increasing scientific interest in atomization - the need to understand the physical structure of liquids under conditions of higher shear rates and interaction with gaseous flow. This need is being met with the publication of Atomization and Sprays, an authoritative, international journal presenting high quality research, applications, and review papers.