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droplet morphology analysis of drop-on-demand inkjet printing

China Foundry 2024年第1期21卷 20-28页

作者： Hu-xiang Xia Takechi Kensuke Tajima Shin Kawamura Yoshiumi Qing-yan Xu Key Laboratory for Advanced Materials Processing Technology(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Toyota Central R&D Labs. Inc.41-1 Yokomichi NagakuteAichi 480-1192Japan Frontier Research Center Toyota Motor Corporation1 Toyota-ChoToyotaAichi 471-8572Japan

As an accurate 2D/3D fabrication tool,inkjet printing technology has great potential in preparation of micro electronic *** morphology of droplets produced by the inkjet printer has a great impact on the accuracy of *** this study,the drop-on-demand(DoD)inkjet simulation model was established,and the accuracy of the simulation model was verified by corresponding *** simulation result shows that the velocity of the droplet front and tail,as well as the time to disconnect from the nozzle is mainly affected by density(ρ),viscosity(μ)and surface tension(σ)of *** the liquid filament is about to disconnect from the nozzle,the filament length and filament front velocity are found to have a linear correlation withσ/ρμand ln(ρ/(μσ1/2)).

关键词： microdevice fabrication inkjet printing droplet morphology modeling and simulation

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

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Chinese Physics B 2021年第2期30卷 487-502页

作者： Peng Wang Jing Li Xin Wang Heng-San Liu Bin Fan Ping Gan Rui-Feng Guo Xue-Yuan Ge Miao-Hui Wang Beijing National Innovation Institute of Lightweight Ltd. Beijing 100083China State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and TechnologyBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

We simulate the gas-atomization process of a close-coupled annular nozzle for vacuum induction gas atomization at a three-dimensional ***,the relationship between the simulated droplet type and experimentally metallic powder is established by comparing the morphology of droplets with ***,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 *** 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 *** results show that the primary atomization process includes the formation of surface liquid film,appearance of serrated ligaments,and shredding of ***,gas recirculation zone plays an important role in formation of the umbrella-shaped liquid *** secondary atomization process is divided into droplet convergence and dispersion stages,and the predicted powder diameter is basically consistent with the *** general,the four main powder shapes are formed by the interaction of five different typical droplets.

关键词： metallic powder close-coupled nozzle two-phase droplet morphology

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