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Jankovic, M.; Mostaghimi, J.

doi:10.1023/a:1021789226599

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…For the plasma jet diagnostics, an enthalpy probe has been used as a diagnostic tool in this work, because it is the most suitable device for measurements of air thermal plasma having a relatively low temperature, strong turbulence flow and complex emission spectral lines [31][32][33][34][35][36][37]. Figure 5 shows a schematic diagram of an enthalpy probe diagnostic system set up in this experiment.…”

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

“…Finally, a PXI model signal converter and a SCXI model signal conditioning system (National instrument Co., Ltd) are employed along with an IBM compatible personal computer (PC) for real time data processing of measured plasma jet properties. The local enthalpy h i of plasma gas can be obtained from the calorimetric measurement method [31][32][33][34][35][36][37], and it can be calculated from the following equation:…”

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

“…During the tare measurement, the probe serves as a water-cooled Pitot tube for the stagnation pressure (p 0 ) measurement [31][32][33][34][35][36][37]. The air plasma may be considered to be incompressible and the plasma velocity can be given by the well-known Bernoulli equation:…”

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

“…In order to evaluate the accuracy of enthalpy probe diagnostics, the uncertainties in the measurement of plasma variables are estimated with typical results of enthalpy probe measurements. According to the standard error analysis technique, the uncertainties of the measured enthalpy and velocity of plasma can be expressed by the following equations, respectively [35,36]: where δ represents the limit of uncertainty associated with each of the measurements of the coolant flow rate ṁc , sampled gas flow rate ṁg , coolant temperature T c , and differential pressure p.…”

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

“…In table 1, the typical measured values of the variables observed in the enthalpy probe measurements are summarized along with their uncertainties [35][36][37]. In this typical example, the coolant mass flow rate is fixed at 1.7 lpm to obtain plasma temperatures over 5000 K at the centre of the plasma jet and the error associated with the coolant flow meter is 0.2%.…”

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

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Enthalpy probe measurements and three-dimensional modelling on air plasma jets generated by a non-transferred plasma torch with hollow electrodes

Kh¹,

Park²,

Choi³

et al. 2008

J. Phys. D: Appl. Phys.

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Thermal flow characteristics of air plasma jets generated by a non-transferred plasma torch with hollow electrodes are experimentally and numerically investigated in order to provide more reliable scientific and technical information, which has been insufficient for their practical applications to material and environmental industries. In this work, a thermal plasma torch of hollow electrode type is first designed and fabricated, and similarity criteria for predicting operational conditions for the scale-up to high-power torches are derived from the arc voltage characteristics measured with various operating and geometry conditions of the torch. The thermal flow characteristics of air plasma jets ejected from the torch are measured by enthalpy probe diagnostics and turn out to have relatively low temperatures of around 3000–7000 K, but show features of other unique properties, such as high energy flux, broad high temperature region and long plasma jet with moderate axial velocity, which are promising for their applications to material syntheses and hazardous waste treatments. Such high enthalpy at a relatively low temperature of air thermal plasma compared with the argon one is due to the high thermal energy residing in the vibrational and rotational states and oxygen dissociation, besides the translational states in monatomic gases such as argon. It is expected that this high specific enthalpy of the air plasma will enable material and environmental industries to treat a large amount of precursors and waste materials effectively at a lower temperature for a longer residence time by the low plasma velocity. It is also found from the measurements that the turbulence intensity influenced by the size of the electrode diameter has a significant effect on the axial and radial profiles of plasma jet properties and that a longer plasma jet is more readily achievable with a larger electrode diameter reducing the turbulence intensity in the external region of the torch. In the numerical studies based on magnetohydrodynamics (MHD) theory, a precise three-dimensional transient numerical model for the internal arc discharge plasma of the torch has been developed along with a practical two-dimensional stationary one for the external thermal plasma jet by considering highly localized distributions of arc roots with circumferential non-uniformity on the electrode wall surfaces, so that more reliable and realistic descriptions on the arc thermal plasma properties become feasible both inside and outside the torch. The numerical calculation results are compared with the experimental data obtained from the probe measurements and found to be in good agreement with them.

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Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

Section: Enthalpy Probe Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

Enthalpy probe measurements and three-dimensional modelling on air plasma jets generated by a non-transferred plasma torch with hollow electrodes

Kh¹,

Park²,

Choi³

et al. 2008

J. Phys. D: Appl. Phys.

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Process Diagnostics and Online Monitoring and Control

Fauchais

Heberlein

Boulos

2013

Thermal Spray Fundamentals

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3D Modeling of Transport Phenomena and the Injection of the Solution Droplets in the Solution Precursor Plasma Spraying

2007

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Solution precursor plasma spraying has been used to produce finely structured ceramic coatings with nano-and sub-micrometric features. This process involves the injection of a solution spray of ceramic salts into a DC plasma jet under atmospheric condition. During the process, the solvent vaporizes as the droplet travel downstream. Solid particles are finally formed due to the precipitation of the solute, and the particle are heated up and accelerated to the substrate to generate the coating. This article describes a 3D model to simulate the transport phenomena and the trajectory and heating of the solution spray in the process. The jet-spray two-way interactions are considered. A simplified model is employed to simulate the evolution process and the formation of the solid particle from the solution droplet in the plasma jet. The temperature and velocity fields of the jet are obtained and validated. The particle size, velocity, temperature, and position distribution on the substrate are predicted.

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Untitled

Cited by 4 publications

References 6 publications

Enthalpy probe measurements and three-dimensional modelling on air plasma jets generated by a non-transferred plasma torch with hollow electrodes

Enthalpy probe measurements and three-dimensional modelling on air plasma jets generated by a non-transferred plasma torch with hollow electrodes

Process Diagnostics and Online Monitoring and Control

3D Modeling of Transport Phenomena and the Injection of the Solution Droplets in the Solution Precursor Plasma Spraying

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