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Chin. Phys. B, 2021, Vol. 30(2): 027502    DOI: 10.1088/1674-1056/abc167
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Close-coupled nozzle atomization integral simulation and powder preparation using vacuum induction gas atomization technology

Peng Wang(汪鹏)1,2, Jing Li(李静)1,2,†, Xin Wang(王欣)1,2, Heng-San Liu(刘恒三)1,2, Bin Fan(范斌) 1,2, Ping Gan(甘萍) 3, Rui-Feng Guo(郭瑞峰) 1,2, Xue-Yuan Ge(葛学元)1,2,‡, and Miao-Hui Wang(王淼辉)1,2,§
1 Beijing National Innovation Institute of Lightweight Ltd., Beijing 100083, China; 2 State Key Laboratory for Advanced Forming Technology and Equipment, China Academy of Machinery and Technology, Beijing 100083, China; 3 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract  We simulate the gas-atomization process of a close-coupled annular nozzle for vacuum induction gas atomization at a three-dimensional scale. Moreover, the relationship between the simulated droplet type and experimentally metallic powder is established by comparing the morphology of droplets with powders. Herein, the primary atomization process is described by the volume-of-fluid (VOF) approach, whereas the prediction of powder diameter after secondary atomization is realized by the VOF-Lagrangian method. In addition, to completely reflect the breaking and deformation process of the metallic flow, we employ the VOF model to simulate the secondary atomization process of a single ellipsoidal droplet. The results show that the primary atomization process includes the formation of surface liquid film, appearance of serrated ligaments, and shredding of ligaments. Further, gas recirculation zone plays an important role in formation of the umbrella-shaped liquid film. The secondary atomization process is divided into droplet convergence and dispersion stages, and the predicted powder diameter is basically consistent with the experiment. In general, the four main powder shapes are formed by the interaction of five different typical droplets.
Keywords:  metallic powder      close-coupled nozzle      two-phase      droplet morphology  
Published:  18 January 2021
PACS:  75.47.Np (Metals and alloys)  
  81.20.Ev (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)  
  47.55.df (Breakup and coalescence)  
  61.82.Bg (Metals and alloys)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51975240) and the Open Fund of State Key Laboratory of Advanced Forming Technology and Equipment (Grant No. SKL2019006).
Corresponding Authors:  Corresponding author. E-mail: wangmh@camtc.com.cn Corresponding author. E-mail: gexueyuan@163.com §Corresponding author. E-mail: lijing2012@buaa.edu.cn   

Cite this article: 

Peng Wang(汪鹏), Jing Li(李静), Xin Wang(王欣), Heng-San Liu(刘恒三), Bin Fan(范斌), Ping Gan(甘萍), Rui-Feng Guo(郭瑞峰), Xue-Yuan Ge(葛学元), and Miao-Hui Wang(王淼辉) Close-coupled nozzle atomization integral simulation and powder preparation using vacuum induction gas atomization technology 2021 Chin. Phys. B 30 027502

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