论文标题
具有外部横向和弱磁场的等离子体中驱动的尘埃涡流特性
Driven dust vortex characteristics in plasma with external transverse and weak magnetic field
论文作者
论文摘要
在计划设置和近期磁性磁性灰尘（MDP）实验中，在存在外部横向和弱磁场（$ {\ bf b} $）的情况下，在存在外部横向和弱磁场（$ {\ bf b} $）的情况下扩展了血浆中有界粉尘流动动力学的二维流体动力模型。该分析表明，由于$ {\ bf e} \ times {\ bf e} \ times {\ bf b} $ {\ bf b} $和$ {\ nabla {\ nabla {\ bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf bf y {在血浆中悬浮。流动解决方案表明，中性压力决定了离子拖拉与$ {\ bf e_a} $ - 力之间的优势。剪切离子 - 拖拉产生抗锁定的圆形涡旋结构，而剪切$ {\ bf e_a} $ - 力非常局部化，并产生了顺时针$ d $ d $形的椭圆形结构，该结构变成了子午线结构，随着$ {\ bf bf b} $的减少。通过改变其幅度和剪切模式数量和鞘层的效果，包括$ {\ bf b} $的强度，在弱的MDP制度内分析，显示流动结构及其动量的明显变化。在高压和较低$ {\ bf b} $的参数状态下，$ {\ bf e_a} $ - 力在离子阻力和特殊的反旋转涡流对上变得可比性或占主导地位。此外，当$ {\ bf b} $被$ 180^0 $ -Degree翻转时，两个驱动程序都会一起起作用并产生一个强大的子午结构，显示了MDP系统中$ {\ bf bf} $的重要性。它进一步讨论了在几个MDP实验和相关的自然驱动流动系统中报道的类似椭圆/子午结构。
The two-dimensional hydrodynamic model for bounded dust flow dynamics in plasma is extended for analysis of driven vortex characteristics in presence of external transverse and weak magnetic field (${\bf B}$) in a planner setup and parametric regimes motivated by recent magnetized dusty plasma (MDP) experiments. This analysis has shown that shear in the ${\bf B}$ can produce a shear internal field (${\bf E_a}$) in between electrons and ions due to the ${\bf E}\times {\bf B}$ and ${\nabla {\bf B}}\times {\bf B}$-drifts that cause rotation of dust cloud levitated in the plasma. The flow solution demonstrates that neutral pressure decides the dominance between the ions-drag and the ${\bf E_a}$-force. The shear ions-drag generates an anti-clockwise circular vortical structure, whereas the shear ${\bf E_a}$-force is very localized and gives rise to a clockwise $D$-shaped elliptical structure which turns into a meridional structure with decreasing ${\bf B}$. Effect of system parameters including the strength of ${\bf B}$ by varying its magnitude and shear mode numbers and the sheath field are analyzed within the weak MDP regime, showing noticeable changes in the flow structure and its momentum. In the parametric regime of high pressure and lower ${\bf B}$, the ${\bf E_a}$-force becomes comparable or dominant over the ion drag and peculiar counter-rotating vortex pairs are developed in the domain. Further, when the ${\bf B}$ is flipped by $180^0$-degree, both the drivers act together and give rise to a single strong meridional structure, showing the importance of ${\bf B}$-direction in MDP systems. It further discussed similar elliptical/meridional structures reported in several MDP experiments and relevant natural driven-dissipative flow systems.
