Numerical and experimental determination of plasma temperature during air plasma spraying with a multiple cathodes torch

Bobzin, Kirsten; Bagcivan, Nazlim; Petković, I.

doi:10.1016/j.jmatprotec.2011.05.001

Cited by 29 publications

(6 citation statements)

References 13 publications

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“…where a = 29.3; b = 0; c = 0 for the liquid medium and a = 20.7; b = 12.3 × 10 3 ; c = 0 for the solid state [39].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The hydrodynamic and electromagnetic phenomena occurring in the plasma spray gun in the case of coating with a TriplexProTM-200 three-cathode device were simulated using a three-dimensional numerical model, but without taking into account the marginal areas of the electrode surfaces. In the same study [39], another model was performed in order to approximate the plasma parameters in the free jet. Both models were validated using a complex analysis system based on argon emission computed tomography by analyzing the temperature distribution recorded during the experiment.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Calculation of the Arc-Sprayed Particles’ Temperature in Transient Thermal Field

2022

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The physical and mechanical properties of the coatings produced by electric arc thermal spraying are closely related to the velocity and temperature of the particles that interact with the substrate surface. Knowing the temperature variation of the sprayed particles allows establishing their aggregation state, respectively determining the spraying distance, so that the state of aggregation of the particles at the impact moment is predominantly liquid. Obviously, when the sprayed particle passes through the spray cone, it cools continuously due to the low and variable temperature of the entrainment gas. This paper aims to determine analytically the thermal behavior of the particles entrained by the gas jet formed at the thermal spraying in an electric arc, depending on the variable temperature, existing along the spraying cone. In this sense, by modeling with finite elements, using the ANSYS program, the temperature inside the spray jet was determined, and by a mathematical model carried out based on the thermal balance equations, the thermal profile of the sprayed particles was determined. The thermal profile demonstrates that their temperature suddenly increases to the solidification temperature, then increases to the melting temperature—due to the latent heat of solidification, after which it decreases to 300 K.

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“…where a = 29.3; b = 0; c = 0 for the liquid medium and a = 20.7; b = 12.3 × 10 3 ; c = 0 for the solid state [39].…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Calculation of the Arc-Sprayed Particles’ Temperature in Transient Thermal Field

2022

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show abstract

“…In the model, the electric current is imposed on the cathodes and leads to a corresponding heating and acceleration of the plasma gas in the generator. The model was firstly developed in 2011 (Ref 17 ) and has been consequently expanded (Ref 18 , 19 ). The approach is capable of calculating the velocity and temperature profile of the plasma gas at the outlet of a TriplexPro-210 torch for the given process parameters.…”

Section: Methodsmentioning

confidence: 99%

Capturing the Influence of Jet Fluctuations on Particles in Plasma Spraying

2022

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Instabilities and fluctuations of the plasma jet in a thermal spray process can have a significant influence on the particle in-flight temperatures and velocities, affecting the properties of resulting plasma-sprayed coatings. Presented in this paper is a novel method for capturing the effects particles are exposed to in the plasma spraying process. High-speed camera images of a plasma jet generated by a cascaded three-cathode plasma generator (TriplexPro-210) were recorded for varying operating conditions. The images are processed using the inverse Abel transform. This transformation accounts for the fact that the images represent a 2D projection of the 3D jet and generates more accurate intensity values that the sprayed particles would experience. These images are then combined with particle tracks resulting from CFD simulations of the plasma jet to match the particles path with the recorded plasma jet. This new method allows a precise description of the plasma intensity experienced by individual particles with a high temporal resolution. The results show a high sensitivity of the method, even detecting the influence on the particles of the plasma jet originating from the cascaded triple arc plasma generator, which is considered as rather stable.

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“…This approach is capable of calculating the velocity and temperature profile of the outlet of the TriplexPro-210 torch for the given process parameters. The model was developed in 2011 [11] and has been consequently expanded [12]- [14]. The second model calculates the propagation of the plasma jet into the atmosphere as well as the acceleration and melting behaviour of injected particles.…”

Section: Calculation Of the Particle Trajectoriesmentioning

confidence: 99%

Capturing the Influence of Jet Fluctuations on Particles in Plasma Spraying

Bobzin

Heinemann

O’Brien

2021

Thermal Spray 2021: Proceedings From the International Thermal Spray Conference

Self Cite

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Instabilities and fluctuations of the plasma jet can have a significant influence on the particle in-flight temperatures and velocities, thus affecting the properties of plasma sprayed coatings. Presented in this paper is a novel method for capturing the effects particles are exposed to in the plasma spraying process. High-speed camera images of a plasma jet generated by a cascaded three cathode plasma generator (TriplexPro-210) are recorded for varying operating conditions. The images are processed using the inverse Abel transform. This transformation accounts for the fact that the images represent a 2-D projection and generates correct intensity values of the plasma jet images. These images are then combined with particle tracks resulting from CFD simulations of the plasma jet to match the particles path with the recorded plasma jet. This new method allows a precise description of the plasma intensity experienced by individual particles with a high temporal resolution. The results show a high sensitivity of the method, it can even detect the influence of the plasma jet originating from the cascaded triple arc plasma generator, which is considered as rather stable, on the particles.

show abstract

Numerical and experimental determination of plasma temperature during air plasma spraying with a multiple cathodes torch

Cited by 29 publications

References 13 publications

Numerical Calculation of the Arc-Sprayed Particles’ Temperature in Transient Thermal Field

Numerical Calculation of the Arc-Sprayed Particles’ Temperature in Transient Thermal Field

Capturing the Influence of Jet Fluctuations on Particles in Plasma Spraying

Capturing the Influence of Jet Fluctuations on Particles in Plasma Spraying

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