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The Effects of Graphite Particles on arc Plasma Characteristics

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Abstract

The interaction between graphite particles and argon plasma in the arc torch is investigated by numerical simulations. The addition of carbon vapor improves the specific heat capacity, electrical conductivity and thermal conductivity of plasma, and decreases its viscosity. It is important to note that the changes in the thermodynamic and transport properties of the plasma substantially affect the arc plasma temperature and the spatial distribution of the carbon vapor concentration. As the graphite particle feed rate increases, the arc will be continuously contracted and the arc electric current density will be increased. The carbon vapor enhances the plasma electrical conductivity, but the heat absorption by the particles reduces the temperature of the plasma, eventually leading to decreased the electrical conductivity. Both result in ascent of the electric field of the arc, so that increase the arc voltage. In addition, the heat flux radial distribution of radiation-absorption of the particles is much less than the thermal conduction, but the particles near the wall absorb radiation from arc region, so that reduce energy loss of the radiation of the arc column.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 11675177 and 11875256).

Funding

This work was supported by the National Natural Science Foundation of China (No. 11675177 and No. 11875256).

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Authors and Affiliations

  1. School of Engineering Science, University of Science and Technology of China, Hefei, 230022, People’s Republic of China

    Zihan Pan, Xianhui Chen, Xiang Yuan, Cheng Wang & Weidong Xia

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  1. Zihan Pan
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  2. Xianhui Chen
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  3. Xiang Yuan
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  4. Cheng Wang
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  5. Weidong Xia
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Correspondence to Xianhui Chen or Weidong Xia.

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Pan, Z., Chen, X., Yuan, X. et al. The Effects of Graphite Particles on arc Plasma Characteristics. Plasma Chem Plasma Process 41, 1183–1203 (2021). https://doi.org/10.1007/s11090-021-10177-4

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  • DOI: https://doi.org/10.1007/s11090-021-10177-4

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