A computational fluid dynamics (CFD) investigation of the flow field and the primary atomization of the close coupled atomizer

Zhao, Wenjun; Cao, Fuyang; Ning, Zhiliang; Zhang, Guoqing; Zhou, Lei; Sun, Jichao

doi:10.1016/j.compchemeng.2012.02.014

Cited by 32 publications

(6 citation statements)

References 16 publications

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“…In this context, gas atomization is a prominent technique applied with many benefits for pre-alloyed powders, due to its efficiency and high performance [9e11]. During gas atomization, a liquid stream is broken up into fine spherical droplets of different sizes by the impact of a highvelocity gas flow [12,13]. The TiAl alloy droplets undergo rapid solidification processing (RSP) with the change of phase selection process toward more ductile metastable phases.…”

Section: Introductionmentioning

confidence: 99%

Size dependent phase transformation in atomized TiAl powders

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Size dependent phase transformation in atomized TiAl powders

et al. 2015

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“…With the development of the CFD methods and the improvement of computing power, the melt phase was introduced in the simulation to enable the studies of breakup, cooling and solidification of the metal phase during gas atomisation. For the primary breakup, several numerical simulations [8][9][10][11][12][13] have been performed by using volume of fluid (VOF) multiphase method to study the melt morphology. Three primary breakup modes under different melt mass flow rates, i.e.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of droplet breakup, cooling, and solidification during gas atomisation

et al. 2023

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As gas atomisation has been the main method for producing high-performance spherical powders in the past decades, its application in the production of metallic powders has become one of the main research subjects in this field. Since it is challenging to directly observe the atomising gas and to investigate melt flow states by experiments, numerical simulation is attracting increasing interest in studying the gas atomisation process. In this work, various computational fluid dynamics models were implemented to simulate the gas atomisation process. With the models, the droplet breakup, cooling, and solidification within the coupled process were investigated. The final mean particle size was predicted through numerical simulations and compared with the statistics extracted from the gas atomisation process, which shows that a reasonable mass median diameter of the particle can be predicted numerically. The results also show a clear relationship between the breakup trajectory and the resulting particle size.

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“…[17] Zeoli et al [18,19] simulated the primary atomization process for different types of atomizer in three dimensions by volume-offluid (VOF) multiphase flow using the Euler method. Zhao et al [20] simplified the geometric model of three-dimensional (3D) symmetric close-coupled nozzles into two-dimensional (2D) axisymmetric form to simulate the primary atomization process, whereas the droplet breaking process did not occur as expected. Arachchilage et al [21] studied the influence of gas pressure on droplet diameter distribution at a threedimensional scale by the VOF method, which reproduced the fragmentation of the metallic liquid flow.…”

Section: Introductionmentioning

confidence: 99%

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

Wang¹,

Li²,

Wang³

et al. 2021

Chinese Phys. B

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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.

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A computational fluid dynamics (CFD) investigation of the flow field and the primary atomization of the close coupled atomizer

Cited by 32 publications

References 16 publications

Size dependent phase transformation in atomized TiAl powders

Size dependent phase transformation in atomized TiAl powders

Numerical analysis of droplet breakup, cooling, and solidification during gas atomisation

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

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