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Bulk viscosity of the rigid rotor one-component plasma
Jarett LeVan1, Marco D Acciarri1, Scott D Baalrud1
1Department of Nuclear Engineering and Radiological Sciences, <a href="https://ror.org/00jmfr291">University of Michigan, Ann Arbor</a>, Michigan 48109, USA.
Physical Review. E
|August 20, 2024
Summary
Bulk viscosity in molecular plasmas can be significant due to rotational effects. Molecular dynamics simulations reveal that long-range Coulomb interactions increase bulk viscosity in diatomic ion plasmas.
Area of Science:
- Plasma Physics
- Computational Physics
- Chemical Physics
Background:
- Bulk viscosity is often overlooked in plasma modeling.
- Molecular plasmas possess rotational degrees of freedom.
- Understanding plasma transport properties is crucial for various applications.
Purpose of the Study:
- To compute the bulk viscosity of strongly coupled diatomic ion plasmas.
- To investigate the influence of molecular rotation on bulk viscosity.
- To analyze the bulk-to-shear viscosity ratio in these systems.
Main Methods:
- Utilizing molecular dynamics simulations.
- Employing the rigid rotor one-component plasma model.
- Characterizing the system with Coulomb coupling (Γ) and bond length (Ω) parameters.
Main Results:
- Long-range Coulomb potential leads to extended rotational relaxation times.
- Extended relaxation times result in substantial bulk viscosity values.
- The bulk-to-shear viscosity ratio varies significantly with Γ and Ω.
Conclusions:
- Bulk viscosity can be substantial in molecular plasmas with rotational degrees of freedom.
- These findings challenge the common neglect of bulk viscosity in plasma models.
- The study highlights the importance of considering molecular dynamics in plasma transport.
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