Plasma transport caused by ion/neutral atom collisions I. Slab model

Auerbach, Steven P.; Cohen, R. H.; Gilmore, J.M.; Mirin, A.A.; Rensink, M.E.

doi:10.1088/0029-5515/24/10/002

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Thus we conclude that for ionized atomic mixtures, the charge-transfer process gives a significant contribution to thermal conductivity. This result confirms the well known fact that the charge-transfer process is of importance in various plasma applications due to its great influence on the process of ions diffusion (see also SubSection 6.3 on diffusion coefficients) and energy transfer [47,3].…”

Section: Thermal Conductivity Coefficientsupporting

confidence: 85%

State-specific transport properties of partially ionized flows of electronically excited atomic gases

Истомин

Кустова

2017

Chemical Physics

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a b s t r a c tState-to-state approach for theoretical study of transport properties in atomic gases with excited electronic degrees of freedom of both neutral and ionized species is developed. The dependence of atomic radius on the electronic configuration of excited atoms is taken into account in the transport algorithm. Different cutoff criteria for increasing atomic radius are discussed and the limits of applicability for these criteria are evaluated. The validity of a Slater-like model for the calculation of state-resolved transport coefficients in neutral and ionized atomic gases is shown. For ionized flows, a method of evaluation for effective cross-sections of resonant charge-transfer collisions is suggested. Accurate kinetic theory algorithms for modelling the state-specific transport properties are applied for the prediction of transport coefficients in shock heated flows. Based on the numerical observations, different distributions over electronic states behind the shock front are considered. For the Boltzmann-like distributions at temperatures greater than 14,000 K, an important effect of electronic excitation on the partial thermal conductivity and viscosity coefficients is found for both neutral and ionized atomic gases: increasing radius of excited atoms causes a strong decrease in these transport coefficients. Similarly, the presence of electronically excited states with increased atomic radii leads to reduced diffusion coefficients. Nevertheless the overall impact of increasing effective cross-sections on the transport properties just behind the shock front under hypersonic reentry conditions is found to be minor since the populations of high-lying electronic energy levels behind the shock waves are low.

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Section: Thermal Conductivity Coefficientsupporting

confidence: 85%

State-specific transport properties of partially ionized flows of electronically excited atomic gases

Истомин

Кустова

2017

Chemical Physics

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“…For the ionization rate we employ the analytical model [9] (T e /e) 1/2 exp(-e/T e ) 6 + T e /e (13) where (ov\ o is a constant in our model and e = 13.6 eV is the ionization energy for deuterium. Since electron radial transport is negligible, electron energy balance is local, i.e.…”

Section: Dmentioning

confidence: 99%

“…( 17)) in a very narrow boundary layer. These runs were discarded because additional physics would be required near the limiter to correctly model them, such as ion/neutral collisions [13]. The specific criterion which we demanded in order for a run to be acceptable was n(0.95)/n max < 0.9, where n(0.95) is the value of the density at a normalized radius r = 0.95.…”

Section: Fig 5 Numerically Obtained Scaling Of Confinement Time Versu...mentioning

confidence: 99%

Effect of temperature gradients on neoclassical scaling of tandem mirror transport

1986

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“…Previous measurements in high density, sloshing-ion plasmas showed that the dominant mechanism for radial losses was electric mobility due to charge-exchange collisions accompanying particle fueling. [18] Because the low fueling rates are adequate to fuel the present plasmas, this mechanism is small and accounts for only aDout 10SJ of the observed transport. Resonant (neoclassical) transport, predicted to be dominant in hot, high-density plasmas, is also small because of low collisionality.…”

Section: Discussionmentioning

confidence: 93%