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Measurement of Specific Enthalpy Under Very Low Pressure Plasma Spray Condition

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Abstract

VLPPS has attracted much attention in recent years, especially concerning its potential applications but not so much concerning the properties of the plasma jet. Operating parameters such as the chamber pressure and the secondary gas flow rate have a strong influence on specific enthalpy and temperature of the plasma jet, and then on the efficient use of the system. In this work, thermodynamic properties measurements under very low pressure (i.e., around 1 mbar) were performed using a modified enthalpy probe (increase of the internal diameter and thermal insulation of the head). Several parameters such as arc current intensity, hydrogen gas flow rate and working distance were considered in order to check their effect on the characteristics of the plasma jet and to determine the variation of the specific enthalpy, temperature, and heat flux versus these parameters.

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Abbreviations

H:

specific enthalpy, kJ/kg

m w :

cooling water flow rate, m3/s

Cp w :

specific heat of water, 4.18 kJ/kg· °C@ 10 °C < T <70 °C

ΔT :

temperature rise of probe cooling water, °C

M g :

sampling gas flow rate at STP (standard temperature 0 °C and pressure 101.3 kPascal), m3/s

ρ w :

density of water, 1000 kg/m3 @20°C

ρ g :

gas density at STP, kg/m3

T :

temperature, K

Q :

quantity of heat, J/s

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

    N. Zhang

  2. LERMPS-UTBM Site de Sévenans, 90010, Belfort Cedex, France

    N. Zhang, F. Sun, L. Zhu, M.P. Planche, H. Liao & C. Coddet

  3. Key laboratory of Materials Modification, Dalian University of Technology, Dalian, 116085, China

    C. Dong

Authors
  1. N. Zhang
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  2. F. Sun
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  3. L. Zhu
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  4. M.P. Planche
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  5. H. Liao
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  6. C. Dong
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  7. C. Coddet
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Correspondence to N. Zhang.

Additional information

This article is an invited paper selected from presentations at the 2011 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2011: Proceedings of the International Thermal Spray Conference, Hamburg, Germany, September 27-29, 2011, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and André McDonald, Ed., ASM International, Materials Park, OH, 2011.

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Zhang, N., Sun, F., Zhu, L. et al. Measurement of Specific Enthalpy Under Very Low Pressure Plasma Spray Condition. J Therm Spray Tech 21, 489–495 (2012). https://doi.org/10.1007/s11666-012-9738-1

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  • DOI: https://doi.org/10.1007/s11666-012-9738-1

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