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Characterization of In-Flight Processing of Alumina Powder Using a DC-RF Hybrid Plasma Flow System at Constant Low Operating Power

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Abstract

The aim of this study is to provide the optimum operating conditions for enhancing in-flight alumina particle heating as much as possible for particle spheroidization and aggregation of melted particles using a DC-RF hybrid plasma flow system even at constant low operating power based on the thermofluid considerations. It is clarified that the swirl flow and higher operating pressure enhance the particle melting and aggregation of melted particles coupled with increasing gas temperature downstream of a plasma uniformly in the radial direction at constant electrical discharge conditions.

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Abbreviations

d p :

particle diameter (μm)

p :

operating pressure (kPa)

Q c :

central gas flow rate (Nℓ/min)

Q carrier :

particle carrier gas flow rate (Nℓ/min)

Q q :

quench gas flow rate (Nℓ/min)

Q sh :

sheath gas flow rate (Nℓ/min)

Q sw :

swirl gas flow rate (Nℓ/min)

T g :

gas temperature (K)

T p :

particle temperature (K)

V p :

particle velocity (m/s)

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Acknowledgments

We would like to extend our sincere thanks to Dr. K. Kawajiri with National Institute of Advanced Industrial Science and Technology and Assistant Prof. H. Takana with Institute of Fluid Science, Tohoku University for their valuable discussions and to Mr. K. Katagiri with our institute for his technical support. This research was partially supported by Grant-in-Aid for Scientific Research (A) (2005-2007) from the Japan Society for the Promotion of Science and a 21st Century COE program Grant (2003-2007) of the International COE of Flow Dynamics from the Ministry of Education, Culture, Sports, Science and Technology.

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Authors and Affiliations

  1. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    H. Nishiyama, M. Onodera, J. Igawa & T. Nakajima

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  1. H. Nishiyama
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  2. M. Onodera
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  3. J. Igawa
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  4. T. Nakajima
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Correspondence to H. Nishiyama.

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Nishiyama, H., Onodera, M., Igawa, J. et al. Characterization of In-Flight Processing of Alumina Powder Using a DC-RF Hybrid Plasma Flow System at Constant Low Operating Power. J Therm Spray Tech 18, 593–599 (2009). https://doi.org/10.1007/s11666-009-9358-6

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  • DOI: https://doi.org/10.1007/s11666-009-9358-6

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