弱磁化等离子体中尘埃涡旋流动分析

Prince Kumar, D. Sharma
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引用次数: 2

摘要

对弱磁化等离子体中驱动尘埃涡旋流动进行了分析。将二维流体力学模型应用于非均匀磁场条件下的密闭尘云,在不存在非保守场和尘荷变化的情况下,恢复了在保守力场条件下驱动的尘涡流动。虽然分析中包含的与时间无关的电场和磁场提供了保守的强迫机制,但最近在尘埃等离子体实验中观察到的基于漂移的机制。Puttscher and A. Melzer,等离子体物理,21,123704(2014)],尘埃涡旋流解被证明是可恢复的。我们研究了由电子E*B漂移产生的极化产生的纯双极电场驱动尘埃流的情况。在没有离子阻力的情况下,磁场梯度有利于剪切E*B漂移,驱动涡旋流动。分析了不同磁场强度、磁场梯度和粉尘流体运动粘度对流函数解析解的影响。分析了B场梯度的影响,并与等离子体鞘层中存在的E场梯度进行了对比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dust vortex flow analysis in weakly magnetized plasma
Analysis of driven dust vortex flow is presented in a weakly magnetized plasma. The 2D hydrodynamic model is applied to the confined dust cloud in a non-uniform magnetic field in order to recover the dust vortex flow driven in a conservative force field setup, in absence of any non-conservative fields or dust charge variation. Although the time independent electric and magnetic fields included in the analysis provide conservative forcing mechanisms, when the a drift based mechanism, recently observed in a dusty plasma experiment by [M. Puttscher and A. Melzer, Physics of Plasmas, 21,123704(2014)] is considered, the dust vortex flow solutions are shown to be recovered. We have examined the case where purely ambipolar electric field, generated by polarization produced by electron E*B drift, drives the dust flow. A sheared E*B drift flow is facilitated by the magnetic field gradient, driving the vortex flow in the absence of ion drag. The analytical stream-function solutions have been analyzed with varying magnetic field strength, its gradient and kinematic viscosity of the dust fluid. The effect of B field gradient is analyzed which contrasts that of E field gradient present in the plasma sheath.
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