Two-temperature chemically-non-equilibrium modeling of argon induction plasmas with diatomic gas

Watanabe, Takayuki; Shigeta, Masaya; Atsuchi, Nobuhiko

doi:10.1016/j.ijheatmasstransfer.2006.05.039

Cited by 23 publications

(18 citation statements)

References 21 publications

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“…The first 2T-NCE model for Ar-N 2 thermal plasma has been reported by Tanaka et al [36] which addressed 30 chemical reactions (forward and backward) for diffusion and convection terms taking into account. Two-temperature chemically-non-equilibrium modeling of argon induction plasmas with diatomic gas has been also reported later [37]. Ye et al [38,39] has developed both steady and pulse-modulated NCE model for Ar-H 2 radio frequency plasmas.…”

Section: Two-temperature Non-chemical Equilibrium (2t-nce)mentioning

confidence: 95%

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure

Al-Mamun

Tanaka

Uesugi

2009

Plasma Chem Plasma Process

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Here the authors developed a two-dimensional two-temperature chemical nonequilibrium (2T-NCE) model of Ar-CO 2 -H 2 inductively coupled thermal plasmas (ICTP) around atmospheric pressure (760 torr). Assuming 22 different particles in this model and by solving mass conservation equations for each particle, considering diffusion, convection and net production terms resulting from 198 chemical reactions, chemical non-equilibrium effects were taken into account. Species density of each particle or simply particle composition was also derived from the mass conservation equation of each one taking the non chemical equilibrium effect into account. Transport and thermodynamic properties of Ar-CO 2 -H 2 thermal plasmas were self-consistently calculated using the first order approximation of the Chapman-Enskog method at each iteration point implementing the local particle composition and temperature. Calculations at reduced pressure (500 and 300 torr) were also done to investigate the effect of pressure on non-equilibrium condition. Results obtained by the present model were compared with results from one temperature chemical equilibrium (1T-CE) model, one-temperature chemically non equilibrium (1T-NCE) model and finally with 2T-NCE model of Ar-N 2 -H 2 plasmas. Investigation shows that consideration of non-chemical equilibrium causes the plasma volume radially wider than CE model due to particle diffusion. At low pressure with same input power, presence of diffusion is relatively stronger than at high pressure. Comparison of present reactive model with non-reactive Ar-N 2 -H 2 plasmas shows that maximum temperature reaches higher in reactive C-H-O molecular system than non-reactive plasmas due to extra contribution of reaction heat.

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Section: Two-temperature Non-chemical Equilibrium (2t-nce)mentioning

confidence: 95%

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure

Al-Mamun

Tanaka

Uesugi

2009

Plasma Chem Plasma Process

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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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“…Heating sources with a high temperature and high energy efficiency are necessary to reduce the vitrification time. Thermal plasmas have received considerable attention due to their unique advantages such as high enthalpy, high chemical reactivity, alterable oxidation or reduction atmosphere in accordance with required chemical reaction, easy and rapid generation of high temperatures, long residence time as well as rapid quenching rate [6]. Thermal plasmas, therefore, have been widely applied for material processing, such as the synthesis of nanoparticles, chemical vapor deposition (CVD) and plasma spraying [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

An innovative energy-saving in-flight melting technology and its application to glass production

Yao

Watanabe

Yano

et al. 2008

Science and Technology of Advanced Materials

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The conventional method used for glass melting is air-fuel firing, which is inefficient, energy-intensive and time-consuming. In this study, an innovative in-flight melting technology was developed and applied to glass production for the purposes of energy conservation and environmental protection. Three types of heating sources, radio-frequency (RF) plasma, a 12-phase alternating current (ac) arc and an oxygen burner, were used to investigate the in-flight melting behavior of granulated powders. Results show that the melted particles are spherical with a smooth surface and compact structure. The diameter of the melted particles is about 50% of that of the original powders. The decomposition and vitrification degrees of the prepared powders decrease in the order of powders prepared by RF plasma, the 12-phase ac arc and the oxygen burner. The largest heat transfer is from RF plasma to particles, which results in the highest particle temperature (1810• C) and the greatest vitrification degree of the raw material. The high decomposition and vitrification degrees, which are achieved in milliseconds, shorten the melting and fining times of the glass considerably. Our results indicate that the proposed in-flight melting technology is a promising method for use in the glass industry.

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Two-temperature chemically-non-equilibrium modeling of argon induction plasmas with diatomic gas

Cited by 23 publications

References 21 publications

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure

Water Plasmas for Environmental Application

An innovative energy-saving in-flight melting technology and its application to glass production

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