Journal ArticleDOI
Knudsen effect on plasma-particle mass transfer. I. Formulation and application to self-diffusion
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In this article, a predictive model was developed by incorporating the Z-potential approach into the jump theory and the predictions of the model were explored through a case study, which indicated that the Knudsen effect is significant and depends strongly on the particle size and the surface conditions.Abstract:
The Knudsen effect on mass transfer between a plasma gas and a small particle is investigated. A predictive model is developed by incorporating the Z-potential approach into the jump theory. The predictions of the model are explored through a case study. The results indicate that the Knudsen effect is significant and depends strongly on the particle size and the surface conditions. The plasma and the particle surface temperatures are also found to be determining factors. Under certain conditions, it is observed that the Knudsen effect can enhance the plasma-particle mass transfer, contrary to the predictions of the previous near-isothermal models.read more
Citations
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Suspension and solution thermal spray coatings
TL;DR: In this article, the emerging methods of coating deposition by suspension and solution thermal spraying are described, where liquid suspensions of fine powders and liquid precursors are injected into flames and/or jets generated in the torches.
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Effect of quenching conditions on particle formation and growth in thermal plasma synthesis of fine powders
TL;DR: In this paper, a mathematical model is developed to determine the effect of quenching conditions on the size characteristics of powders produced in reactive thermal plasma systems, and the results of the present srudy indicate that the size properties of plasma-produced powders can be significantly enhanced by gradual, regulated quenched, as opposed to the rapid quench conventionally used in the past.
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Protective Coatings by Plasma Spraying: A Review
R. Sivakumar,Shrikant V. Joshi +1 more
TL;DR: In recent years, the use of plasma-sprayed protective coatings has gained increasing acceptance for prolonging the service life of critical components exposed to aggressive environments during normal operation as mentioned in this paper.
Journal ArticleDOI
Prediction of in-flight particle parameters during plasma spraying of ceramic powders
Shrikant V. Joshi,R. Sivakumar +1 more
TL;DR: In this paper, a theoretical prediction model is presented to estimate the in-flight velocity, temperature, and size of a ceramic particle traversing through a plasma flame, which can be used in the model assisted development of various plas...
Journal ArticleDOI
A prediction model to assist plasma and HVOF spraying
TL;DR: In this paper, a theoretical prediction model is developed to estimate the in-flight velocity, temperature and size of a particle during plasma and HVOF spraying, and the salient features of this model are outlined and the model predictions are examined through some example calculations performed under typical spraying conditions.
References
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Journal ArticleDOI
Properties of Gases at Very High Temperatures
I. Amdur,E. A. Mason +1 more
TL;DR: In this article, known intermolecular force laws are used to calculate virial coefficients of the equation of state and the transport properties at very high temperatures for the rare gases and for molecular nitrogen.
Journal ArticleDOI
Effect of the Knudsen number on heat transfer to a particle immersed into a thermal plasma
Xi Chen,E. Pfender +1 more
TL;DR: In this paper, a correction factor which depends on the Knudsen number was introduced into the expressions for heat fluxes obtained previously based on the continuum approach, and the correction factor was shown to be stronger for smaller particles and it is also more pronounced for an Ar-H2 plasma.
Journal ArticleDOI
Behavior of small particles in a thermal plasma flow
Xi Chen,Emil Pfender +1 more
Abstract: In this paper computational results are presented which reveal the effects of the Knudsen number on heat transfer and drag of small particles in a flowing thermal argon plasma. The Knudsen number is restricted to moderate values so that “temperature jump” and “velocity slip” conditions may be employed, and for the governing equations the continuum approach remains valid. It is shown that the ratio of the heat fluxes with and without the Knudsen effect is almost identical to the ratio obtained by the authors for the case of pure heat conduction. This fact is very important for modeling of the behavior of particles injected into an actual plasma reactor when the Knudsen effect has to be taken into account.