论文标题
在微重力条件下的三维复合物等离子体中的剪切流动
Shear flow in a three-dimensional complex plasma in microgravity conditions
论文作者
论文摘要
使用国际空间站（ISS）上的Plasmakristall-4（PK-4）仪器在微重力条件下在微重力条件下实验研究了三维复合物等离子体中的剪切流。通过施加操纵激光束的辐射压力，在微粒的扩展悬浮液中产生了剪切流。分析了流动中的单个粒子轨迹，并从这些轨迹使用Navier-Stokes方程式，对复杂等离子体的运动粘度进行了上层估计，计算出$ 0.2 $ - $ 6.7〜 {\ rm mm^2/s} $的范围。该估计值远低于以前在3D复合物等离子体的基于地面实验中报道的估计值。讨论了这种差异的可能原因。
Shear flow in a three-dimensional complex plasma was experimentally studied in microgravity conditions using Plasmakristall-4 (PK-4) instrument on board the International Space Station (ISS). The shear flow was created in an extended suspension of microparticles by applying the radiation pressure force of the manipulation-laser beam. Individual particle trajectories in the flow were analyzed and from these, using the Navier-Stokes equation, an upper estimate of the complex plasma's kinematic viscosity was calculated in the range of $0.2$--$6.7~{\rm mm^2/s}$. This estimate is much lower than previously reported in ground-based experiments with 3D complex plasmas. Possible reasons of this difference are discussed.
