Fast modelling of plasma jet and particle behaviours in spray conditions

Delluc, Guy; Ageorges, Hélène; Pateyron, Bernard; Fauchais, Pierre

doi:10.1615/hightempmatproc.v9.i2.30

Cited by 15 publications

(9 citation statements)

References 13 publications

(22 reference statements)

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“…The model Jet & Poudres used [36] is assumed to be axi-symmetric, steady and parabolic without swirl component. It is derived from the Genmix algorithm [37] and the mixing length [38] is used to describe the turbulence. However, the length of turbulence proposed by Genmix has been corrected to account for the specificity of the plasma flow: -It is set at zero as soon as the temperature is over 8,000 K; where the jet is assumed to be fully laminar, -The mixing length is written = 0.03 s where s is the distance between the calculation point and the torch axis at the nozzle exit.…”

Section: Simplified Plasma Jet Modelingmentioning

confidence: 99%

Phenomena Involved in Suspension Plasma Spraying Part 1: Suspension Injection and Behavior

Fazilleau

Delbos

Rat

et al. 2006

Plasma Chem Plasma Process

156

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Suspension Plasma Spraying (SPS) is a relatively new deposition process which enables to spray micron and submicron particles. It offers the possibility to form finely structured coatings with intermediate thicknesses of a few tens of microns. In order to have a better understanding in SPS, the two parts of this paper are devoted to the description of the phenomena involved in this spray process. The first part focuses on the suspension injection within a d.c. plasma jet. Simplified models, backed by plasma and suspension diagnostics, allow describing the interaction plasma-suspension. It is shown that the suspension is atomized by the plasma jet before the starting of the droplets vaporization. The plasma jet recovers its flow symmetry about 15 mm downstream of the nozzle exit. The strong influence of plasma instabilities on suspension injection is also highlighted. The second part is devoted to solid particle treatments and the coating formation.

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Section: Simplified Plasma Jet Modelingmentioning

confidence: 99%

Phenomena Involved in Suspension Plasma Spraying Part 1: Suspension Injection and Behavior

Fazilleau

Delbos

Rat

et al. 2006

Plasma Chem Plasma Process

156

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“…The exit temperature (left picture) and velocity profiles (right picture), presented in Fig. 9, are also interesting because they allow seeing that the profiles are not symmetric and so that the temperature and velocity profiles generally used by some authors [11] [12]in order to model only the plasma jet are not realistic.…”

Section: Plasma Torch Configurationmentioning

confidence: 99%

Theoretical study of hydrodynamic flow in thermal plasma devices

2006

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In this paper we focus our discussion on thermal plasmas created by electric arc. Due to the electrons mobility, the energy transferred by Joule effect to the gas, leads to temperature around 10 000 K. Thermal plasmas are very used in numerous processes like spraying, cutting, welding, waste treatment and are also present in numerous situations such as in interruption systems: high and low voltage circuit breakers or in natural phenomena: lightning strike. In order to be improved, thermal plasma processes necessitate a better understanding of the medium. Numerical modeling is now largely used to analyze and to predict the behavior of arcs and hydrodynamic flows to improve thermal plasma processes. Due to the increase of computer performances and to the availability of commercial computational fluid dynamics codes, the 2D modeling mainly developed in the 80's and 90's have been progressively replaced for a few years by 3D models. But is there always a real interest to develop such kind of codes if we consider the increase of accuracy in comparison with the increase of CPU time and the level of the assumptions? In order to give some elements for the discussion, we compare in the first part two physical conditions: one based on the flow injection and the other on the arc attachment, using 2D and 3D models. The legitimacy of the 2D model in then studied. In the second part, we illustrate through example the necessity of the use of 3D models due to complexities in configurations. Finally the difficulty of the 3D models validation is underlined. : 52.30 1 Basis of the models In this paper, all the presented developments, in two dimensions (2D) and in three dimensions (3D), use the commercial code Fluent (V4.5) [1] based on the resolution of the electromagnetism and Navier-Stokes equations by the control volume method of Patankar [2]. The models allow describing the flow in term of the velocity components, and temperature fields. User-defined subroutines are added to the model to implement the extra transport equations. Subroutines are also modified to allow thermodynamic and transport properties to be functions of temperature, pressure and mass fraction. In addition, it is also necessary to include source terms in the momentum and energy equations reflecting the Lorentz force, the ohmic heating and the radiative cooling, in order to successfully simulate an electric arc. Previous works [3]-[6] not presented here, making a comparison between experimental results and the 2D model results allow to validate the developments in the plasma medium. PACS

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“…The surface of substratum at the distance x/d = 8-12 would be hit by stable force of the jet stream and the value of kinetic energy is ultimate. Figure 2 represents the proportional distribution of plasma jet and dispersed ceramic particles temperatures, measured or calculated by different authors [12,13]. The trajectories of plasma flow are very similar and have a near agreement.…”

Section: Resultsmentioning

confidence: 76%

“…2. Nondimensional distributions of plasma temperature (1 calculated with "Jets&Poudres" by other authors [12], 3 our experimental research, 4 calculated with "Jets&Poudres", 6 calculated by other authors using other numerical models [11]) and ceramic 50 µm particles' temperature (2 calculated with "Jets&Poudres" by other authors [12], 5 our calculation with "Jets&Poudres").…”

Section: Resultsmentioning

confidence: 83%

Measurement and numerical simulation of two-phase plasma flow in plasma spray process

Grigaitienė¹,

Valincius²,

Kėželis³

2009

Lithuanian J. Phys.

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Interaction of plasma jet with hard ceramic particles was numerically investigated by means of "Jets&Poudres" software improved and applied to model a specific plasma jet. The data on free plasma jet, with injected dispersed particles, its temperature and velocity distribution, as well as particles' melting state are presented. It was found that dispersed particles achieve higher temperature and velocity values than plasma gas at dimensionless distance x/d = 8-12 from exhaust nozzle. Numerical investigations were compared with experimental data. The results show that applied numerical model of two-phase high temperature jet calculation is in good agreement with experimental data and could be used to determine the optimal plasma spray parameters for coatings with desirable characteristics.

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Fast modelling of plasma jet and particle behaviours in spray conditions

Cited by 15 publications

References 13 publications

Phenomena Involved in Suspension Plasma Spraying Part 1: Suspension Injection and Behavior

Phenomena Involved in Suspension Plasma Spraying Part 1: Suspension Injection and Behavior

Theoretical study of hydrodynamic flow in thermal plasma devices

Measurement and numerical simulation of two-phase plasma flow in plasma spray process

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