Transport coefficients of ionized argon

Devoto, R. S.

doi:10.1063/1.1694396

Cited by 323 publications

(159 citation statements)

References 37 publications

Supporting

Mentioning

152

Contrasting

Unclassified

Order By: Relevance

“…The transport and thermodynamic properties of argon and water plasma were calculated rigorously from the kinetic theory. For argon, the mass density ρ, the specific heat under constant pressure c p and the sonic velocity were taken from [1], the thermal conductivity λ, the electrical conductivity σ and the dynamical viscosity µ from [2]. For water plasma, the transport and thermodynamic properties are based on the results published in [3].…”

Section: Description Of the Physical Modelmentioning

confidence: 99%

Performance of water and hybrid stabilized electric arcs: the impact of dependence of radiation losses and plasma density on pressure

2006

View full text Add to dashboard Cite

Processes in the worldwide unique type of thermal plasma generator with water vortex stabilization and combined stabilization of arc by argon flow and water vortex have been numerically studied. Two-dimensional axisymmetric numerical model assumes laminar and compressible plasma flow in the state of local thermodynamic equilibrium. The calculation domain includes the arc discharge area between the near-cathode region and the outlet nozzle of the plasma torch. Radiation losses from the arc are calculated by the partial characteristics method for atmospheric pressure water and argon-water discharges. Thermal, electrical and fluid-dynamic characteristics of such arcs have been studied for the range of currents 150÷600 A under the assumption that radiation losses and plasma density depend linearly on pressure. It was proved that, taking this dependence into account, plasma velocity decrease while power losses from the arc by radiation and radial conduction increase with current. Outlet plasma temperature as well as electric potential drop remain practically unchanged.PACS : 52.25.Jm

show abstract

Section: Description Of the Physical Modelmentioning

confidence: 99%

Performance of water and hybrid stabilized electric arcs: the impact of dependence of radiation losses and plasma density on pressure

2006

View full text Add to dashboard Cite

show abstract

“…(8) Here, is the dimensionless dynamic viscosity, is the "viscous" velocity, (9) Figure 1 gives the temperature dependence of dynamic viscosity of argon. One can see that, in the neighborhood of T ≈ 10 000 K, the viscosity reaches a maximal value and decreases with further increase in temperature.…”

Section: Analytical Solution Of Equation Of Motionmentioning

confidence: 99%

Generalized Poiseuille profiles in plasma flows in a stabilized region of a plasma generator

Sinkevich

Chikunov

2005

High Temp

View full text Add to dashboard Cite

The equations of motion and energy balance in view of Joule heat release and temperature dependence of the coefficient of viscosity are used to generalize the Poiseuille solution to the case of stabilized laminar flow of low-temperature plasma in the channel of a plasma generator. Analytical relations are convenient for use in estimating various effects associated with a flow of plasma in channels and in processing the experimental results. The effect of the nonmonotonic temperature dependence of dynamic viscosity on the velocity profile is investigated. It is demonstrated that the nonmonotonic variation of viscosity over the channel cross section in the general case causes the emergence of two inflection points in the velocity profile; this, in turn, may cause the emergence of an instability due to the hydrodynamic mechanism of Kelvin-Helmholtz rather than to the mechanism of superheating. The numerical solutions of the Poiseuille and Elenbaas-Heller equations in a wide range of the working parameters of a plasma generator support the conclusions based on analytical solutions of these equations.

show abstract

“…The coefficients of the viscosity and the thermal conductivity of argon were taken from [8]. The viscosity and the thermal conductivity coefficients of iron vapour were taken from [9].…”

Section: Modellingmentioning

confidence: 99%

Modelling of time dependent plasma plume induced during laser welding

2006

View full text Add to dashboard Cite

Theoretical modelling of the plasma plume induced during welding of iron sheets with CO 2 laser are presented. The set of equations consists of equation of conservation of mass, energy, momentum and the diffusion equation and is solved with the use of commercially available program Fluent 6.1. The computations are made for the laser power of 1 700 W and shielding gas argon. Two solutions are taken into account stationary and non-stationary. The results show significant difference between these two cases.

show abstract

Transport coefficients of ionized argon

Abstract: The electrical conductivity, translational and reactive thermal conductivity and viscosity have been computed for ionized argon in thermodynamic equilibrium at pressues from 0.001-1000 atm and temperatures to 35 000°K. Comparison of the values with experiments shows reasonable agreement.

Cited by 323 publications

References 37 publications

Performance of water and hybrid stabilized electric arcs: the impact of dependence of radiation losses and plasma density on pressure

Performance of water and hybrid stabilized electric arcs: the impact of dependence of radiation losses and plasma density on pressure

Generalized Poiseuille profiles in plasma flows in a stabilized region of a plasma generator

Modelling of time dependent plasma plume induced during laser welding

Contact Info

Product

Resources

About