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Numerical simulation and experimental investigation on powder transport of a new-type annular coaxial nozzle

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Abstract

The annular coaxial nozzle has good convergence and is widely used in laser melting deposition (LMD). In this paper, a new-type annular coaxial nozzle is developed, which can transform four-channel powder flow into annular distribution through the internal channel to obtain a more uniform distribution of powder in the circumferential direction. A three-dimensional computational fluid dynamics (CFD) numerical model is established. The dynamic behavior of Fe-based powder is described by discrete phase model (DPM). The influence of gas on powder particles is described by two-way turbulence coupling model. The convergence and transport characteristics of the nozzle are revealed. The accuracy of CFD model is verified by powder feeding experiment, and the deposition performance of powder nozzle is verified by single-track deposition experiment. The results show that the nozzle can provide stable powder feeding and excellent convergence characteristics. The powder flow is converged in a “Y” shape on the longitudinal section. The higher the powder concentration at the focal plane of the nozzle, the smaller the aspect ratio of single-track coating. The powder utilization rate of the nozzle can reach 76.97%.

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Data availability

The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No.61772365), the National Key R&D Program of China (Grant No. 2018YFB0407302), and the Tianjin Province Science and Technology Projects (Grant No.17JCQNJC04500, 17JCYBJC15100).

Funding

This manuscript is supported by Hanning Chen (the National Natural Science Foundation of China (Grant No.61772365), the National Key R&D Program of China (Grant No. 2018YFB0407302) and the Tianjin Province Science and Technology Projects (Grant No.17JCQNJC04500, 17JCYBJC15100)).

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Authors and Affiliations

  1. School of Mechanical Engineering, Tiangong University, Tianjin, 300387, China

    Yelin Xia, Zhaozhen Huang & Hanning Chen

  2. School of Computer Science and Technology, Tiangong University, Tianjin, 300387, China

    Hanning Chen & Xiaodan Liang

  3. Laser Technology Institute, Tiangong University, Tianjin, 300387, China

    Jianbo Lei

Authors
  1. Yelin Xia
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  2. Zhaozhen Huang
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  4. Xiaodan Liang
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Contributions

Yelin Xia: data curation, methodology, writing original draft.

Zhaozhen Huang: experiment.

Hanning Chen: funding acquisition, writing & editing.

Xiaodan Liang: investigation.

Jianbo Lei: conceptualization, writing & editing.

Corresponding authors

Correspondence to Hanning Chen or Jianbo Lei.

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Xia, Y., Huang, Z., Chen, H. et al. Numerical simulation and experimental investigation on powder transport of a new-type annular coaxial nozzle. Int J Adv Manuf Technol 115, 2353–2364 (2021). https://doi.org/10.1007/s00170-021-07294-x

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