Bulk viscosity of the rigid rotor one-component plasma
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910461041049600 |
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| author | LeVan, Jarett Acciarri, Marco Baalrud, Scott |
| author_facet | LeVan, Jarett Acciarri, Marco Baalrud, Scott |
| contents | Bulk viscosity of a plasma consisting of strongly coupled diatomic ions is computed using molecular dynamics simulations. The simulations are based on the rigid rotor one-component plasma, which is introduced as a model system that adds two degrees of molecular rotation to the traditional one-component plasma. It is characterized by two parameters: the Coulomb coupling parameter, $Γ$, and the bond length parameter, $Ω$. Results show that the long-range nature of the Coulomb potential can lead to long rotational relaxation times, which in turn yield large values for bulk viscosity. The bulk-to-shear viscosity ratio is found to span from small to large values depending on the values of $Γ$ and $Ω$. Although bulk viscosity is often neglected in plasma modeling, these results motivate that it can be large in molecular plasmas with rotational degrees of freedom. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_18175 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bulk viscosity of the rigid rotor one-component plasma LeVan, Jarett Acciarri, Marco Baalrud, Scott Plasma Physics Bulk viscosity of a plasma consisting of strongly coupled diatomic ions is computed using molecular dynamics simulations. The simulations are based on the rigid rotor one-component plasma, which is introduced as a model system that adds two degrees of molecular rotation to the traditional one-component plasma. It is characterized by two parameters: the Coulomb coupling parameter, $Γ$, and the bond length parameter, $Ω$. Results show that the long-range nature of the Coulomb potential can lead to long rotational relaxation times, which in turn yield large values for bulk viscosity. The bulk-to-shear viscosity ratio is found to span from small to large values depending on the values of $Γ$ and $Ω$. Although bulk viscosity is often neglected in plasma modeling, these results motivate that it can be large in molecular plasmas with rotational degrees of freedom. |
| title | Bulk viscosity of the rigid rotor one-component plasma |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2405.18175 |