Distribution of the potential and concentration of electrons in low-temperature plasma with hollow microparticles

© 2016, Islamic Azad University (IAU). Using approximation of a uniform background (the jellium model) for a condensed dispersed phase, the analytical expressions describing a spatial distribution of the potential of the electric field and electron concentration in the low-temperature plasma at equilibrium which contains hollow spherical microparticles are obtained. The influence of heating temperature of plasma on the above distributions is studied, and the dependencies of the charge on microparticle radius, the size of the microparticle cavity and the absolute temperature of plasma are calculated. It is shown that electrons can be emitted not only into the surrounding plasma but also into the cavity of the particles

Distribution of electric field near the surface of the aluminum oxide particle in the dust-electron thermal plasma

© Published under licence by IOP Publishing Ltd. We obtained the equation, which describes the distribution of electrical field in an equilibrium dust-electron plasma taking into account parameters of the electron gas inside the dust particles. The inclusion of these parameters performed on the basis of the model of "solid- state plasma," considering the condensed particle system as the ion core and the free electron gas. These calculations are performed for aluminum oxide particles

Some numerical simulation results of the dynamic temperature distribution in dc plasma torch Thermoplasma 50-01

© Published under licence by IOP Publishing Ltd. A DC plasma torch "Thermoplasma 50-01" has been modeled and simulated by developing a 2D axisymmetric model of laminar flow and heat transfer coupled to electromagnetic fields. As a result of the numerical solution, the dynamics of the formation of the temperature field and the velocity field in the plasma torch channel and at its exit is presented. The numerical results of the gas temperature and axial velocity result to be quite satisfactory

Calculation of distribution of potential and electron concentration in the dust-electron thermal plasma with the axial geometry particles

© Published under licence by IOP Publishing Ltd. We obtained the equation, which describes the distribution of the potential and the electron density in an equilibrium dust-electron plasma taking into account parameters of the electron gas inside the axial geomtry dust particles. The inclusion of these parameters performed on the basis of the model of "solid-state plasma," considering the condensed particle system as the ion core and the free electron gas

Calculation of distribution of potential near the surface of metal particle in the dust-electron thermal plasma

© Published under licence by IOP Publishing Ltd. We obtained the equation, which describes the distribution of the potential in an equilibrium dust-electron plasma taking into account parameters of the electron gas inside the dust particles. The inclusion of these parameters performed on the basis of the model of "solid- state plasma," considering the condensed particle system as the ion core and the free electron gas. The analytical expressions for the potential distributions in thermal equilibrium dust- electron plasma were obtained, using a number of simplifying assumptions. It is found that near the particle surface there is a large gradient of the electric potential and as a result the concentration offree electrons, i.e. electrons in the dust particle are located in a potential well. It is shown that the form of the potential barrier at the particle surface depends on the plasma temperature, particle size and concentration

Study of dust-electron plasma discharge on condition parallel of the velocity vector of the gas flow and electric field

Investigated non-independent electrical discharge in the longitudinal flow of dust-electron plasma. Found that the charge transfer in the discharge gap is mainly free electrons and positively charged dust particles. © Published under licence by IOP Publishing Ltd

Characteristics of potential well for nondegenerate electronic gas in a equilibrium dusty plasma

Calculated of the potential well for electrons of the dust-electron plasma depending on the temperature, size of the dust particles, the distance between them and the kind of material of which they consist. The shape of the potential well is significantly different from the rectangular approximation. © Published under licence by IOP Publishing Ltd

Experimental setup for plasma treatment of disperse materials in the arc plasma jet

The experimental setup for the plasma treatment of particulate materials was created. Spend the processing of composite powder of chromium oxide with aluminium oxide

Air plasma sprayed coatings of self-fluxing powder materials

© Published under licence by IOP Publishing Ltd. The article discusses the structural features of self-fluxing coatings obtained by plasma spraying air from entering the hub ring and the gas-dynamic focusing powder. It was shown that, unlike the unilateral spot powder inlet into the plasma jet, the use of the annular input node allows to increase heating efficiency and to accelerate the particles in the plasma stream. By optical and scanning electron microscopy that most of the particles forming the coating, in the plasma jet is in a molten or plasticized condition. Transmission electron microscopy revealed that high cooling rates of such particles contribute to the formation of γ-SMC supersaturated solid solution Ni-based average grain size of 80 nm

Influence of metal macroparticles to the electron density in a dusty plasma

© Published under licence by IOP Publishing Ltd. We obtained the equation, which describes electron density in an equilibrium dusty plasma taking into account parameters of the electron gas inside the dust particles. The inclusion of these parameters performed on the basis of the model of "solid-state plasma," considering the condensed particle system as the ion core and the free electron gas. The shape of potential barrier at the particle surface assumed as a rectangular