Thermodynamic and Transport Properties of Argon Plasma Arc in Non-chemical Equilibrium in Time Change
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概要
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Various studies have been carried out on the particle composition of ionized Argon containing excited atoms in a steady state. In some of these reports, the thermodynamic and transport properties were calculated under conditions of chemical equilibrium and LTE (Local Thermal Equilibrium). However, there have been few reports of the particle composition and thermodynamic and transport properties of ionized Argon under conditions of non-chemical equilibrium in time change. In this study, the time taken for the system to change from a non-equilibrium state to an equilibrium state was elucidated for an Argon plasma arc under changing temperature conditions (from 300K to 10,000K). First, the particle composition of partially ionized Argon plasma changing from a non-equilibrium state to an equilibrium state was calculated using a chemical kinetic method at 3,000K-25,000K, without taking radiation into account. The thermodynamic and transport properties including mass density, enthalpy, specific heat, electrical and thermal conductivity and viscosity were calculated based on a Chapman-Enskog first order approximation using the values obtained for particle composition in the equilibrium state. These results showed that the method is valid. Second, the particle composition and thermodynamic and transport properties were investigated under conditions of changing temperature (from 300K to 10,000K). It was shown that the particle composition changed from a non-equilibrium state to an equilibrium state in the order of μs. The thermodynamic and transport properties were separated with the changing or not changing category in non-chemical equilibrium in time change.
- 2008-12-01
著者
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Shimizu Toshihiro
Graduate School Of Science And Engineering Chuo University
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Inaba Tsuginori
Graduate School Of Science And Engineering Chuo University