关于中温热等离子体流中粒子和电磁边界条件的研究
On the particle and electromagnetic boundary conditions in a mesothermal plasma flow
- Universidad Politécnica de Madrid（马德里理工大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文针对中温热等离子体流中电子边界条件难题，提出考虑电子漂移速度的部分反射模型及基于安培-麦克斯韦定律的电场边界，实现准中性并改进膨胀等离子体的瞬态描述。
AI中文摘要：
中温热等离子体流的全动力学建模在描述电子和电磁场的边界条件方面面临重大挑战。由于电子比离子具有更高的迁移率，电子会延伸到离子的下游，这阻碍了瞬态过程中出流边界条件的实施。尽管电子漂移速度 $u_e$ 通常被忽略，因为 $u_e \simeq u_i < v_{th,e}$，其中 $u_i$ 是离子的体速度，$v_{th,e}$ 是电子的热速度，但我们将展示在粒子注入和出流边界条件中考虑该速度对于实现电荷和电流密度的准中性至关重要。我们提出了一种新的电子部分反射模型，以表示准稳态和瞬态。此外，我们将展示如何利用安培-麦克斯韦定律来更好地表示出流边界处的瞬态电场，相比经典的“零场”诺伊曼边界条件，无需任何数值参数。利用这些新的边界条件，我们改进了膨胀中温热等离子体的准稳态和瞬态描述。
英文摘要：
The fully kinetic modeling of mesothermal plasma flows presents significant challenges in the description of boundary conditions for the electrons and the electromagnetic field. Due to their higher mobility compared to ions, electrons extend downstream of the ions, which hinders the implementation of the outflow boundary conditions during transient states. Although the electron drift velocity, $u_e$, is usually neglected as $u_e \simeq u_i < v_{th,e}$, where $u_i$ is the bulk velocity of the ions and $v_{th,e}$ is the thermal velocity of the electrons, we will show how accounting for it, both at the injection of particles and at the outflow boundary condition, is of great importance to achieve quasi-neutrality of charge and current densities. A new partial reflection model for electrons is presented to represent quasi-steady and transitory states. Additionally, we will show how we can employ Ampere-Maxwell's law to better represent the transitory electric field at the outflow boundary compared to the classical `zero-field' Neumann boundary without requiring any numerical parameters. With these new boundary conditions, we improve the quasi-steady and transitory descriptions of expanding mesothermal plasmas.
