Thermodynamic and Transport Properties of Ar Thermal Plasmas with Polymer Ablated Vapors and Influence of Their Inclusions on Plasma Temperature

et al. 2009

Elect Comm in Japan

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SUMMARYInfluence of polymer powder injection into Ar thermal plasmas was investigated by numerical approaches. Thermal plasma-polymer solid coupling phenomena such as melting and evaporation were considered to study plasma-quenching effect of polymer injection. Dominant process for decay of plasma temperature was examined by changing thermodynamic parameters such as melting, boiling temperatures and their latent heats of solid and liquid polymers. As a result, thermodynamic properties of evaporated polymer vapor directly affect plasma-quenching phenomena more markedly than the properties of liquid and solid which influence plasma quenching efficiency through the amount of evaporation.

Section: Effect Of Thermal Properties Of Ablated Vapor and Solid Polymentioning

confidence: 91%

Numerical simulation of thermal interaction between polymer and argon induction thermal plasma

Takeuchi

et al. 2009

Elect Comm in Japan

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“…Then we calculated the thermodynamic and transport properties by applying the first-order Chapman-Enskog approximation to the calculated properties, combined with a set of data on collision cross-sections and the sum of internal states for the respective particles [14]. This analytical model requires the above properties for the POM and PTFE vapors produced by the polymer materials, and for the air that initially fills the computational space.…”

Section: Thermodynamic and Transport Properties Of Polymer Ablation Vmentioning

confidence: 99%

Effect of polymer ablation gas on arc quenching properties around current zero

Onchi

Electrical Engineering Japan

2012

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The influence of polymer ablation on arc properties such as the temperature distribution and arc conductance in the current decay process was investigated by numerical approaches. A numerical thermofluid model was developed for a simplified circuit breaker with POM or PTFE ablation. In this model, thermal plasma-polymer solid coupling phenomena such as melting and evaporation were taken into account without any empirical model based on measurements, unlike other existing numerical thermofluid models. The dominant process for the decay of arc conductance was examined by changing the thermodynamic parameters such as the melting and boiling temperatures of solid polymers, or the thermal conductivity and electrical conductivity of the ablation gas. It was found that the gas density, thermal conductivity, and electrical conductivity of the ablation gas were more effective for decaying arc conductance than any other thermodynamic parameters.

“…These transport properties were obtained by the first order approximation of ChapmanEnskog method [59]. Detailed method for calculation of collision integral had been reported earlier by the co-author Tanaka et al [60,61]. The expressions for various transport parameters are given as follows:…”

Section: Calculation Of Transport Propertiesmentioning

confidence: 99%

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

Al-Mamun

Plasma Chem Plasma Process

2009

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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.