Conductivity and diffusion coefficients in fully ionized strongly coupled plasma: Method of molecular dynamics

Бобров, А. А.; Bunkov, A. M.; Bronin, S. Ya.; Klyarfeld, A. B.; Zelener, B. B.; Zelener, B. V.

doi:10.1063/1.5109384

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…Nano‐scale models are developed in time using MD, which is now a powerful tool. MD simulation is a common technique in material science and is broadly employed in several disciplines such as mechanics (Chen et al., 2020; Einalipour Eshkalak et al., 2020), physics (Bobrov et al., 2019), chemistry (Luk et al., 2017), and biology (Kitamura et al., 2018). It helps us to analyze and explain the microscopic features of material failure, which also identifies obscure aspects of bulk measurements.…”

Section: Methodsmentioning

confidence: 99%

Understanding the Anisotropic Mechanical Behavior of Single‐Crystalline Alpha Quartz From the Insight of Molecular Dynamics

Molaei

2022

JGR Solid Earth

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Rock engineering applications of importance today include slope stability, radioactive waste disposal, geothermal energy extraction, underground excavations that include tunneling, mining, CO 2 storage, and coal gasification, and many other topics. Important aspects of these applications include safety, environmental hazards, cost, and maintenance requirements. Rock has a heterogeneous microstructure in nature, which is made up of several minerals. The failure characteristics of the material are determined by the mechanical properties of these minerals and their interaction. Constitutive rules in material mechanics are commonly used to express these qualities, such as strength, fracture toughness, and failure pattern.Most classical rock fracture mechanics consider the rock body as a homogeneous, isotropic solid when dealing with macro scales, such as rock behavior in drilling procedures. This hypothesis ignores the impact of significant discontinuities. Regarding the complexity of rock properties, several studies were accomplished to investigate the effect of grain contacts (

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Section: Methodsmentioning

confidence: 99%

Understanding the Anisotropic Mechanical Behavior of Single‐Crystalline Alpha Quartz From the Insight of Molecular Dynamics

Molaei

2022

JGR Solid Earth

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“…At the same time, it is well known (see, for example, [5,[13][14][15][16] and references therein) that, at least in the case of a weak Coulomb interaction, when the interaction parameter Γ = e 2 /aT is small (a n 4 3 is the De Broglie wavelength for electron, T and m e are the system temperature and electron mass respectively), the results of the classical consideration of the thermodynamic functions and kinetic characteristics of the CS are in a good agreement with both the experimental data and the molecular dynamic modeling (applicable with certain restrictions and additional assumptions). In this article, based on the consideration of a series of perturbation theory for a quantum CS, an explanation is given for this agreement.…”

Section: Introductionmentioning

confidence: 93%

On the problem of the classical limit for statistical characteristics of a quantum Coulomb plasma

Trigger

2023

Phys. Scr.

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The general structure of the perturbation theory series for the thermodynamic potential of asystem of electrons and point ions is discussed. In the classical limit, when Planck’s constant h tends to zero,the particular terms of the perturbation theory series diverge due to the impossibility of maintainingof stability of a purely classical system of the opposite sign charges attracted to each other. Atthe same time, it is known that in a certain range of parameters, a thermodynamic potentialthat does not contain Planck’s constant is a good approximation. Such thermodynamic functionsdescribes the experimental data well and corresponds to the molecular dynamics calculations ofmodel quasi-Coulomb systems. It is shown that the transition to a purely classical description, whichimplies the limit h → 0, is impossible, but the terms of the series containing h are small for certainplasma parameters and can be discarded. This is the rationale explanation of using classical modelsand approximations to describe plasma in certain parameter ranges. On this basis, a hypothesisis formulated about the absence of a classical limit for all measurable physical properties (including kinetic characteristics) of the Coulomb model of plasma, in which point particles interact according to the Coulomb law and, therefore, there are no adjustable parameters.

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“…number density of electrons, D e is the electron diffusion coefficient [43]. The energy exchange between the electrons and heavy particles [37] is:…”

Section: The Energy Equation Of Electronsmentioning

confidence: 99%

3D computational study of arc splitting during power interruption: the influence of metal vapor enhanced radiation on arc dynamics

Huo¹,

Wang²,

Cao³

2020

J. Phys. D: Appl. Phys.

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Arc splitting is one of the most important processes in accomplishing a power interruption by multiplying the number of voltage drops. During arc-plate interaction, the arc roots erode and vaporize the metals which significantly alters the gas composition and plasma properties, such as the radiation absorption coefficient. In this work, we perform a 3D computational study of arc splitting in a circuit breaker. In order for the study to be systematic, the metal vaporization, species transport, and radiative heat transfer are integrated into the magnetohydrodynamics modeling with some special considerations. Firstly, the simulation considers the ferromagnetic effect of steel plates. Secondly, the metal-vapor-enhanced radiation is numerically implemented by the discrete ordinate method with consideration given to the banded radiation spectrum. Thirdly, the simulation model incorporates a near-electrode layer to implement the voltage drop and imposes additional heat flux on the arc spots. The simulation results show that the metal vaporization not only influences the arc dynamics (via Stefan flow) but also enhances the local radiation intensity. Besides, due to the ferromagnetic effect, the magnetic field increases dramatically during arc splitting. However, the self-induced magnetic force has quite a different influence on the motion of sub-arcs, which prevents even and concurrent arc splitting. This simulation reveals that the magnetic-field-induced uneven splitting can be compensated by the enhanced pressure wave or externally applied transversal magnetic field. This study is expected to explore more applications in simulating arc interruption and improve the design of highly-efficient circuit breakers.

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Conductivity and diffusion coefficients in fully ionized strongly coupled plasma: Method of molecular dynamics

Cited by 19 publications

References 16 publications

Understanding the Anisotropic Mechanical Behavior of Single‐Crystalline Alpha Quartz From the Insight of Molecular Dynamics

Understanding the Anisotropic Mechanical Behavior of Single‐Crystalline Alpha Quartz From the Insight of Molecular Dynamics

On the problem of the classical limit for statistical characteristics of a quantum Coulomb plasma

3D computational study of arc splitting during power interruption: the influence of metal vapor enhanced radiation on arc dynamics

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