Modeling of non-equilibrium argon–oxygen induction plasmas under atmospheric pressure

Atsuchi, Nobuhiko; Shigeta, Masaya; Watanabe, Takayuki

doi:10.1016/j.ijheatmasstransfer.2005.07.052

Cited by 37 publications

(23 citation statements)

References 36 publications

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“…Inductively coulpled plasma torches have been investigated also using thermal nonequilibrium approaches [30,25,23]: these studies have shown that for pressure higher that 0.5 bar NLTE conditions exists only in the discharge fringes (near cold gas injection regions and torch walls) where high temperature gradients exist. Moreover, for argonhydrogen mixtures Ye et al [31] showed that NLTE effects are much less pronounced that in the case of pure argon, as a result of higher electron-heavy particle cross section for hydrogen species than for argon species.…”

Section: Confidential: Not For Distribution Submitted To Iop Publishmentioning

confidence: 99%

A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system

Colombo¹,

Ghedini²,

Sanibondi³

2010

J. Phys. D: Appl. Phys.

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To cite this version:V Colombo, E Ghedini, P Sanibondi. A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system. Journal of Physics D: Applied Physics, IOP Publishing, 2010, 43 (10), pp.105202. <10.1088/0022-3727/43/10/105202>. A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively-coupled plasma system V Colombo, E Ghedini, P Sanibondi Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (DIEM), Alma Mater Studiorum -Università di Bologna, Via Saragozza 8, 40123 Bologna, Italy E-mail: paolo.sanibondi@unibo.it Abstract.A three dimensional numerical model for the simulation of the behavior of a commercial inductively coupled plasma (ICP) torch with non-axisymmetric reaction chamber has been developed, taking in account turbulence and gas mixing through RNG k-theory and the combined diffusion approach of Murphy, respectively.The effects of changing coil current frequency, the hydrogen mixing in an argon primary gas and the flow patterns and temperature distributions which take place in a reaction chamber with a lateral gas outlet system and two observation windows have been investigated, with the final aim of setting up a computational tool able to predict the main features of plasma assisted treating and processing of injected raw materials.Three-dimensional shapes of the temperature, velocity and mass fraction fields have been obtained and analyzed for an Ar-H 2 mixture at atmospheric pressure.Computations have been performed with two different coil current frequencies, i.e. 3 MHz and 13.56 MHz, showing that for the lower value the 3-D effects in the discharge are enhanced.Accurate mixing and demixing mechanisms have been investigated in both cases, including considerations on the relative importance of different thermal diffusion contributions due to mole fraction and temperature gradients.Temperature distributions in the reaction chamber for different cases have been correlated to different flow patterns and recirculation flows which take place as a consequence of the non-axisymmetry of the reaction chamber.

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Section: Confidential: Not For Distribution Submitted To Iop Publishmentioning

confidence: 99%

A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system

Colombo¹,

Ghedini²,

Sanibondi³

2010

J. Phys. D: Appl. Phys.

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“…С начала 2000-х годов стали появляться расчёты неравновесной воздушной плазмы в однотемпературной и многотемпературной постановках. Не претендуя на полноту, укажем лишь на некоторые работы [10][11][12][13][14][15].…”

Section: постановка задачиunclassified

Numerical modeling of flows of different plasma constituting gases in RF-plasmatron facility

Власов¹,

Zalogin²,

Kovalev³

2019

PhChGD

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Numerical results of plasma flow parameter studies a represented in the paper for a high temperature facility with inductively coupled 1 MWt power plasmatorch (RF-plasmatron) operating with different work gases. Argon, nitrogen, air and carbon dioxide/nitrogen mixture (corresponding to Martian atmosphere) were chosen for the study. Modelling the problem of discharge chamber flow was based on mutual consideration of Navier-Stokes and Maxwell equations at given mass flow rates (G = 5 ÷ 30 g/s) over pressure range of р = 10 ÷ 200 mbar and delivered power (energy supply) of N = 50 ÷ 300 kWt. Values of parameters at the discharge chamber exit (Fig. 1) were used then for computation of flow in the work chamber and around test models and probes (Fig. 2). Gas mixture models accounting for nonequilibrium thermochemical processes were utilized under solution of the problems. Developed soft ware is used for both plasma flow diagnostics and interpretation of tests on heat transfer, specification of thermal stability and catalicity of heat shield materials.

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“…Thermal plasmas provide the advanced tool for waste treatment. For the environmental problems, thermal plasmas have received much attention due to their high chemical reactivity, easy and rapid generation of high temperature, high enthalpy to enhance the reaction kinetics, oxidation and reduction atmosphere in accordance with required chemical reaction, and rapid quenching capability (10 5 -10 6 K s −1 ) to produce chemical nonequilibrium compositions [1][2][3][4][5][6][7][8][9]. Thermal plasmas have been widely applied to many fields because of these advantages.…”

Section: Introductionmentioning

confidence: 99%

Water Plasmas for Environmental Application

Watanabe¹

2010

Industrial Plasma Technology

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Modeling of non-equilibrium argon–oxygen induction plasmas under atmospheric pressure

Cited by 37 publications

References 36 publications

A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system

A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system

Numerical modeling of flows of different plasma constituting gases in RF-plasmatron facility

Water Plasmas for Environmental Application

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