Vortex formation driven by the particle flow at the interface of a phase-separated binary complex plasma under microgravity condition

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

EPL Pub Date : 2024-08-26 DOI:10.1209/0295-5075/ad6bbd

Sheng Pan, Wei Yang, Andrey M. Lipaev, Andrey V. Zobnin, Deng-Hui Li, Shan Chang, Anton N. Shkaplerov, Sergey V. Prokopyev, Markus Thoma and Cheng-Ran Du

引用次数: 0

Abstract

Microparticles of two sizes are confined in a dc discharge in a glass tube with polarity switch in the PK-4 laboratory on board the International Space Station. Small and big particles separate from each other presumably due to the unbalance of the force under microgravity condition, forming an ellipsoidal interface. Particles close to the symmetric axis of the cylindrical glass tube are driven by a manipulation laser and a particle flow is generated. The flow velocity depends not only on the laser current but also on the configuration and location of the particle cloud. Counterintuitively, it is observed that a vortex can be formed at the interface, only if the flow velocity is below a certain critical value. Our experiments provide a great opportunity to study the new facets of vortex formation at particle-resolved level.

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微重力条件下二元复合等离子体相分离界面粒子流驱动的涡流形成

在国际空间站上的 PK-4 实验室中，两种大小的微粒在一个带极性开关的玻璃管中进行直流放电。在微重力条件下，小颗粒和大颗粒可能由于力的不平衡而相互分离，形成一个椭圆形界面。靠近圆柱形玻璃管对称轴的粒子在操纵激光的驱动下产生粒子流。流动速度不仅取决于激光电流，还取决于粒子云的结构和位置。与直觉相反的是，只有当流速低于某个临界值时，才会在界面上形成涡流。我们的实验为在粒子分辨水平上研究涡旋形成的新面貌提供了一个很好的机会。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

EPL 物理-物理：综合

CiteScore

3.30

自引率

5.60%

发文量

332

审稿时长

1.9 months

期刊介绍： General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology. Letters submitted to EPL should contain new results, ideas, concepts, experimental methods, theoretical treatments, including those with application potential and be of broad interest and importance to one or several sections of the physics community. The presentation should satisfy the specialist, yet remain understandable to the researchers in other fields through a suitable, clearly written introduction and conclusion (if appropriate). EPL also publishes Comments on Letters previously published in the Journal.