论文标题
弱磁化等离子体中的尘埃涡流流量分析
Dust vortex flow analysis in weakly magnetized plasma
论文作者
论文摘要
驱动粉尘涡流流的分析以虚弱的磁化等离子体为例。在没有任何非保守性场或灰尘电荷变化的情况下，将2D流体动力模型应用于非均匀磁场中的牢固的尘埃云，以恢复在保守的力场设置中驱动的灰尘涡流流。尽管分析中包含的时间独立的电场和磁场提供了保守的强迫机制，但是当基于漂移的机制最近在尘土飞扬的血浆实验中观察到[M. Puttscher和A. Melzer，《等离子体物理学》，21,123704（2014）]，被证明已恢复了尘埃涡流流溶液。我们研究了一种情况，即由电子E*B漂移产生的极化产生的纯粹的双极电场，驱动灰尘流动。磁场梯度促进了剪切的E*B漂移流，在没有离子阻力的情况下驱动涡流流动。已经用不同的磁场强度，粉尘流体的梯度和运动场粘度分析了分析流功能溶液。分析了B场梯度的效果，该梯度与血浆鞘中存在的E场梯度的作用进行了对比。
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.
