关于气体雾化过程中金属液滴变形和破裂与颗粒形态和空心颗粒形成的数值模拟

IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
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引用次数: 0

摘要

使用考虑液滴冷却和凝固的流体体积(VOF)方法模拟了金属液滴在气体雾化过程中的变形和破裂。建立了典型粉末形态与液滴破裂行为之间的相关性,以指导球形粉末颗粒的制备。结果表明,当液滴的空气动力与粘性力之比增大时,球形颗粒的形成增强,而当该比值减小时,预期的液滴破裂模式发生改变,或仅发生液滴变形。通过对中空粒子形成和演化过程的数值模拟,观察到了几种典型的情况,如开放式中空膜形成、膜闭合、气泡离心和气泡脱离。通过提高气体速度或液滴温度,可获得较高的非平衡拉普拉斯压力或较低的粘滞力,从而使气泡与液滴内部分离。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation on Metallic Droplet Deformation and Breakup Concerning Particle Morphology and Hollow Particle Formation During Gas Atomization

The deformation and breakup of metallic droplets during gas atomization were simulated using a volume of fluid (VOF) approach that considered droplet cooling and solidification. The correlation between the typical powder morphology and droplet breakup behavior was established to guide the preparation of spherical powder particles. The results showed that upon increasing the ratio of aerodynamic to viscous force of the droplet, the formation of spherical particles was enhanced, while upon decreasing this ratio, the expected droplet breakup mode changed or only droplet deformation occurred. Several typical scenarios were observed from the numerical simulations of the hollow particle formation and evolution process, e.g., open hollow film formation, film closure, bubble centrifugation, and bubble detachment. By increasing the gas velocity or droplet temperature, a higher non-equilibrium Laplace pressure or lower viscous forces was achieved, which separated the bubbles from the interior of the droplet.

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来源期刊
CiteScore
7.40
自引率
17.80%
发文量
8456
审稿时长
3.6 months
期刊介绍: The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.
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