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Process modeling gas atomization of close-coupled ring-hole nozzle for 316L stainless steel powder production |
| Peng Wang(汪鹏)1,2, Jing Li(李静)1,2,‡, Hen-San Liu(刘恒三)1,2, Xin Wang(王欣)1,2, Bo-Rui Du(杜博睿)1,2, Ping Gan(甘萍)3, Shi-Yuan Shen(申世远)1,2, Bin Fan(范斌)1,2, Xue-Yuan Ge(葛学元)1,2,§, and Miao-Hui Wang(王淼辉)1,2,† |
1 State Key Laboratory for Advanced Forming Technology and Equipment, China Academy of Machinery and Technology, Beijing 100083, China;
2 Beijing National Innovation Institute of Lightweight Ltd., Beijing 100083, China;
3 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The paper aims at modeling and simulating the atomization process of the close-coupled ring-hole nozzle in vacuum induction gas atomization (VIGA) for metallic powder production. First of all, the primary atomization of the ring-hole nozzle is simulated by the volume of fluid (VOF) coupled large eddy simulation (LES) model. To simulate the secondary atomization process, we use the method of selecting the droplet sub-model and the VOF model. The results show that the ring-hole nozzle forms a gas recirculation zone at the bottom of the delivery tube, which is the main reason for the formation of an annular liquid film during the primary atomization. In addition, the primary atomization process of the ring-hole nozzle consists of three stages: the formation of the serrated liquid film tip, the appearance and shedding of the ligaments, and the fragmentation of ligaments. At the same time, the primary atomization mainly forms spherical droplets and long droplets, but only the long droplets can be reserved and proceed to the secondary atomization. Moreover, increasing the number of ring holes from 18 to 30, the mass median diameter (MMD, d50) of the primary atomized droplets decreases first and then increases, which is mainly due to the change of the thickness of the melt film. Moreover, the secondary atomization of the ring-hole nozzles is mainly in bag breakup mode and multimode breakup model, and bag breakup will result in the formation of hollow powder, which can be avoided by increasing the gas velocity.
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Received: 06 November 2020
Revised: 23 December 2020
Accepted manuscript online: 30 December 2020
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PACS:
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75.47.Np
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(Metals and alloys)
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61.82.Bg
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(Metals and alloys)
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47.55.df
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(Breakup and coalescence)
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81.20.Ev
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(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
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| 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:
Miao-Hui Wang, Jing Li, Xue-Yuan Ge
E-mail: wangmh@camtc.com.cn;lijing2012@buaa.edu.cn;gexueyuan@163.com
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Cite this article:
Peng Wang(汪鹏), Jing Li(李静), Hen-San Liu(刘恒三), Xin Wang(王欣), Bo-Rui Du(杜博睿), Ping Gan(甘萍), Shi-Yuan Shen(申世远), Bin Fan(范斌), Xue-Yuan Ge(葛学元), and Miao-Hui Wang(王淼辉) Process modeling gas atomization of close-coupled ring-hole nozzle for 316L stainless steel powder production 2021 Chin. Phys. B 30 057502
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