强耦合复杂等离子体中压缩马赫锥的动力学
Dynamics of compressional Mach cones in a strongly coupled complex plasma
摘要：
利用广义流体动力学（GH）模型，研究了强耦合引起的流体可压缩性修正对尘埃等离子体介质中压缩马赫锥动力学的影响。对于给定的马赫数和爱泼斯坦阻力，在强耦合区发现了横向尾迹的显著结构变化。随着流体可压缩性的增加，归一化扰动尘埃密度的峰值幅度先增大，达到最大值后单调减小。当尘埃粒子间的耦合作用增强时，马赫锥臂在速度矢量剖面上分裂成小的结构，锥臂的张开角随介质的可压缩性增大而减小。
英文摘要：
Using a Generalised-Hydrodynamic (GH) fluid model we study the influence of strong coupling induced modification of the fluid compressibility on the dynamics of compressional Mach cones in a dusty plasma medium. A significant structural change of lateral wakes for a given Mach number and Epstein drag force is found in the strongly coupled regime. With the increase of fluid compressibility, the peak amplitude of the normalised perturbed dust density first increases and then decreases monotonically after reaching its maximum value. It is also noticed that the opening angle of the cone structure decreases with the increase of the compressibility of the medium and the arm of the Mach cone breaks up into small structures in the velocity vector profile when the coupling between the dust particles increases.
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