Electric field intensity due to an arc in a developed turbulent air stream

Zhukov, M. F.; Zasypkin, I. M.; Mishne, I. I.; Sazonov, M. I.

doi:10.1007/bf00908654

Cited by 2 publications

(3 citation statements)

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“…One of the disadvantages of plasma spraying technology is the low electrical efficiency of the generated plasma jet at the outlet of the plasma torch, as well as the significant technological consumption of the sprayed powder material. The papers of well-known scientists are devoted to increasing the efficiency of plasma spraying [1][2][3][4][5][6][7][8]. Considerable attention has been paid to the study of the heat transfer issues in a plasma flow and the numerical modeling in the papers of J. P. Trelles, V. Rat, Z. Duan, J. F. Coudert, J. J. Gonzales, and C. Baudry [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The usage of turbulence models for the simulation of plasma flows is significantly more difficult than their use for most other industrial applications due to their inherent characteristics. The papers of well-known scientists are devoted to increasing the efficiency of plasma spraying [1][2][3][4][5][6][7][8]. Considerable attention has been paid to the study of the heat transfer issues in a plasma flow and the numerical modeling in the papers of J. P. Trelles, V. Rat, Z. Duan, J. F. Coudert, J. J. Gonzales, and C. Baudry [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

et al. 2023

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The paper presents an analysis of the heat transfer processes in electric arc plasma conditions between the powder material and the plasma jet in different convective states. The heat transfer processes in the plasma jet generated for coating deposition are considered based on varying the conditions for the jet–powder interaction. The formed coating deposited onto the substrate acts as an indicator of the heat transfer efficiency. The heat transfer between the plasma jet and the powder material is facilitated by the turbulent nature of the plasma jet. The presented calculation results demonstrate the influence of the plasma flow turbulence on the motion of the fine powder and heating of the generated jet at the outlet of the plasma torch. An analysis of the influence of plasma flow turbulence on the acceleration and heating of fine powder particles was carried out. The experimental results allowed for the determination of the effect of the plasma jet turbulence degree on the heat transfer processes between the plasma and fine powder: the technological efficiency of the device with varying parameters of the spraying process and the flow rates of the material supply and plasma-forming gas were presented. The values of the plasma-forming gas supply rate, the material supply rate, and the Reynolds number were obtained while the other process parameters were fixed. The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme No. FSEG-2023-0012).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

et al. 2023

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“…An electric arc as a physical phenomenon has been known for about two hundred years and has found wide use in many technological processes used in various industries -from machine construction to medicine [1][2][3][4][5][6][7][8][9][10][11]. An electric arc discharge is used in technological processes that involve metal cutting, e.g., for very productive and highprecision cutting of special steels and nonferrous metals (plasma arc cutting) alike [1, 2, 7].…”

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confidence: 99%

Heat Transfer Between a Plasma Jet and a Metal Surface in a Cut Cavity

Veremeichik

Sazonov

Khvisevich

et al. 2015

J Eng Phys Thermophy

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UDC 539.3+681.7:068 and D. L. Tsyganov a,bInvestigations are presented of the formation of a plasma jet and of the current-density and heat-fl ux distributions in the process of metal cutting along the cut cavity with direct and reverse polarities of the plasmatron connection. The study of the specifi c features of heat transfer of the arc with the surface of the cut cavity was carried out on the basis of the developed plasma unit which makes it possible to model the technological process of separating metal cutting. A sectional cut model is proposed which can be used to work out and optimize the methods of determination of cutting parameters.Introduction. An electric arc as a physical phenomenon has been known for about two hundred years and has found wide use in many technological processes used in various industries -from machine construction to medicine [1][2][3][4][5][6][7][8][9][10][11]. An electric arc discharge is used in technological processes that involve metal cutting, e.g., for very productive and highprecision cutting of special steels and nonferrous metals (plasma arc cutting) alike [1, 2, 7]. The prospect for using plasma arc cutting in the technological processes of metal working is connected with the wide capabilities and high effi ciency of contracted stabilized electric arcs.A contracted arc exerts a thermal and an appreciable force effect on the working zone. It is known [7,8,[12][13][14]] that the total force effect and the distribution of the thermal effect are determined by a number of factors: the arc current, the fl ow rate of a plasma-forming gas, the diameter of a plasma-forming nozzle, and the length of the free area of the arc.The main properties of an electric arc that are central to the technological processes of cutting are intense thermal and dynamic effects on a metal. The wide application of a plasma arc for working of metal products is limited by the inadequate study of this trend in plasma technology [3,4,7].As known [4,11], complex and interrelated thermal, gasdynamic, and electromagnetic processes proceed in the cut cavity formed under the effect of a plasma arc. As a result of this effect on the plasma stream, intense heating and melting of a metal occur, which are followed by the removal of the melt from the cut cavity by the plasma stream. The process of heat and mass transfer, mechanical mixing of the molten metal, and change in the state of the substance proceed over the entire volume near the front wall of the cut cavity. While superimposing on each other, these processes cause the formation of temperature and mechanical force fi elds and of an electric fi eld, which are generally unsteady.The present-day experimental methods for determining the parameters of an electric arc [8,[14][15][16] are distinguished by complexity, which limits the possibilities of using them for designing new and optimizing existent engineering devices and technological processes and makes them almost impracticable for determining the arc parameters in a dynamic regime to effi ciently control...

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Electric field intensity due to an arc in a developed turbulent air stream

Cited by 2 publications

References 0 publications

The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

The Influence of Electric Arc Plasma Turbulence on Heat Transfer Processes Involving Powder Materials

Heat Transfer Between a Plasma Jet and a Metal Surface in a Cut Cavity

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