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Diffusion in two-temperature thermal plasmas.

V Rat¹, J Aubreton, M F Elchinger

¹SPCTS University of Limoges, 123 avenue A. Thomas, 87060 Limoges cedex, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|January 7, 2003

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This study derives combined diffusion coefficients for two-temperature plasmas, ensuring mass conservation. The findings are crucial for accurately modeling thermal plasmas with distinct electron and heavy species temperatures.

Area of Science:

Plasma Physics
Chemical Engineering
Thermodynamics

Background:

Accurate modeling of thermal plasmas requires understanding species transport.
Previous models for combined diffusion coefficients assumed a single temperature for all species.
Deviations in electron and heavy species temperatures are common in many plasma applications.

Purpose of the Study:

To derive combined diffusion coefficients for a two-temperature thermal plasma.
To investigate ambipolar diffusion in plasmas where electron and heavy species temperatures differ.
To ensure derived coefficients are consistent with mass conservation principles.

Main Methods:

Assumed chemical equilibrium for a plasma mixture of two homonuclear nonreacting gases.

Related Experiment Videos

Derived expressions for ambipolar diffusion, retaining coupling between electrons and heavy species.

Calculated combined diffusion coefficients under specific conditions.

Main Results:

Successfully derived combined diffusion coefficients for two-temperature plasmas.
Demonstrated that the new coefficients satisfy mass conservation, unlike previous decoupled models.
Presented illustrative results for argon-hydrogen plasmas at 1 bar up to 25,000 K.

Conclusions:

The derived combined diffusion coefficients accurately represent transport in two-temperature plasmas.
Retaining the coupling between electrons and heavy species is essential for mass conservation.
The results provide a more accurate basis for modeling thermal plasma behavior.