Scrutiny of spray jet and impact characteristics under dispersion effects of powder injection parameters in APS process

Djebali, Ridha; El-Ganaoui, M.; Jaouabi, Abdallah; Pateyron, Bernard

doi:10.1016/j.ijthermalsci.2015.09.027

Cited by 15 publications

(11 citation statements)

References 21 publications

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“…Recently, the Lattice Boltzmann Method (LBM) has met with significant success for numerical simulation and modelling of many classical and complex flows [7][8][9][10]. The LBM has been used recently to investigate flows under external magnetic field.…”

Section: Magnetic Fieldmentioning

confidence: 99%

Conjugate Effects of Buoyancy and Magnetic Field on Heat and Fluid Flow Pattern at Low-to-Moderate Prandtl Numbers

Djebali

Abbassi

Rouahi

2016

ILCPA

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This study aims to present a numerical investigation of unsteady two-dimensional natural convection of an electrically conducting fluid in a square medium under externally imposed magnetic field. A temperature gradient is applied between the two opposing side walls parallel to ydirection, while the floor and ceiling parallel to x-direction are kept adiabatic. The coupled momentum and energy equations associated with the Lorentz 'decelerating' force as well as the buoyancy force terms are solved using the single relaxation lattice Boltzmann (LB) approach. The flow is characterized by the Rayleigh number Ra (10 3 -10 6 ), the Prandtl number Pr (0.01-10), the Hartman number Ha (0-100) determined by the strength of the imposed magnetic field and its tilt angle from x-axis ranging from 0° to 90°. The changes in the buoyant flow patterns and temperature contours due to the effects of varying the controlling parameters and associated heat transfer are examined. It was found that the developed thermal LB model gives excellent results by comparison with former experimental and numerical findings. Starting from the values 10 5 of the Rayleigh number Ra and Ha=0, the flow is unsteady multicellular for low Prandtl number typical of liquid metal. Increasing gradually Pr, the flow undergoes transition to steady bicellular. The transition occurs at a threshold value between Pr=0.01 and 0.1. Increasing more the Prandtl number, the flow structure is distorted due to the viscous forces which outweigh the buoyancy forces and a thermal stratification is clearly established. For high Hartman number, the damping effects suppress the unsteady behaviour and results in steady state with extended unicellular pattern in the direction of Lorentz force and the heat transfer rate is reduced considerably.

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Section: Magnetic Fieldmentioning

confidence: 99%

Conjugate Effects of Buoyancy and Magnetic Field on Heat and Fluid Flow Pattern at Low-to-Moderate Prandtl Numbers

Djebali

Abbassi

Rouahi

2016

ILCPA

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“…The properties of the coatings produced in the plasma spray process are affected by factors such as the plasma torch operation, the state of the generated plasma jet, the properties of the injected powder, and the placement of the substrate [4][5][6][7][8][9][10][11][12][13]. In order to improve the quality and productivity of functional coatings, many studies have been carried out over the past few decades.…”

Section: Introductionmentioning

confidence: 99%

“…A resolution of the in-flight particle is performed in [21] for consideration of the heat transfer inside the particle. A special attention has been paid on the dispersion of the injection parameters [7,8] in order to approach a real commercial application as well as on the analysis of the coatings on the substrate plane. Bobzin et al [10] has included the pipe for powder feeding in the computational domain to account for the injection dispersion of the particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Spatially Fluctuating Heating of Particles in a Plasma Spray Process

Zhu

Baeva

Testrich

et al. 2022

Plasma Chem Plasma Process

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The work is concerned with the effect of a spatially fluctuating heating of Al2O3 particles with diameters of 5–120 μm during a plasma spray process. A plasma jet is generated in a mixture of Ar (40 NLPM) and H2 (14 NLPM) and in pure Ar at an electric current of 600 A. The tracing of the injected particles in the plume region of the plasma jets is considered in the framework of a three-dimensional model taking into account a turbulent fluid flow. It is shown that the heat source for the injected particles exhibits a well pronounced spatially fluctuating structure due to the enhancement of the thermal conductivity resulting from dissociation and ionization of the molecular gas in the temperature range of 2500–4000 K and 13,000–14,000 K, respectively. During their travel towards the substrate, the particles are therefore repeatedly heated in the gas mixture in contrast to the case of pure argon. Particles injected in the gas mixture reach the substrate with a higher average temperature and velocity.

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“…The kinetic nature brings certain advantages over conventional numerical methods, as natural for parallel computing, easy handling of complex geometries, particle-based method, only density distribution function fk (x, t) as dependent variable, algebraic operation, a large range of applicability from microscopic to macroscopic scales. The LBM has, also, the beneficial feature of simulating complex fluid flows such as multiphase flows [1], multicomponents [2] flows, porous media flows, flows with suspensions and compressible flows [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann Method Computation of Turbulent High-Temperature Plasma Jets

Djebali¹

2018

GJES

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This paper aims, firstly, to provide an investigation of plasma jets dynamics by the help of the Lattice Boltzmann method (LBM) and second to test the computational efficiency of the LB method by comparison of its results to former measurements and numerical findings. The plasma gas is the argon injected at 520 m/s and 13500 K. In this study we accounted for highly variable thermophysical properties dependence on temperature. The LB results using the proposed model seems to give an excellent compromise between former experimental and numerical results using classical methods (FDM, FVM), while the deviations were found with other simulations attempts by the LB method.

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Scrutiny of spray jet and impact characteristics under dispersion effects of powder injection parameters in APS process

Cited by 15 publications

References 21 publications

Conjugate Effects of Buoyancy and Magnetic Field on Heat and Fluid Flow Pattern at Low-to-Moderate Prandtl Numbers

Conjugate Effects of Buoyancy and Magnetic Field on Heat and Fluid Flow Pattern at Low-to-Moderate Prandtl Numbers

Effect of a Spatially Fluctuating Heating of Particles in a Plasma Spray Process

Lattice Boltzmann Method Computation of Turbulent High-Temperature Plasma Jets

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