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Modified Enskog kinetic theory for strongly coupled plasmas
Scott D Baalrud1, Jérôme Daligault2
1Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA.
Summary
This study extends Enskog kinetic theory to model transport coefficients in strongly coupled plasmas, accurately capturing kinetic contributions but not potential contributions at very high coupling.
Area of Science:
- Plasma Physics
- Kinetic Theory
- Statistical Mechanics
Background:
- Strongly coupled plasmas exhibit complex behaviors not fully described by traditional kinetic theories.
- Existing effective potential transport theories need refinement to account for short-range correlations.
Purpose of the Study:
- To develop a model for transport coefficients in strongly coupled plasmas by incorporating short-range correlation effects.
- To extend Enskog kinetic theory concepts to charged particle systems.
Main Methods:
- Applied Enskog kinetic theory of hard-spheres to model transport coefficients.
- Extended effective potential transport theory by introducing an exclusion radius based on Coulomb repulsion.
- Tested model predictions for self-diffusion and shear viscosity against molecular dynamics simulations.
Main Results:
- The developed model accurately captures the kinetic contributions to transport coefficients.
- The model does not fully account for potential contributions at very strong coupling (Γ≳30).
Conclusions:
- The Enskog-based approach provides an accurate description of kinetic transport in plasmas.
- Further work is needed to incorporate potential contributions for a complete description at strong coupling.
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