Convection in a dusty radio-frequency plasma under the influence of a thermal gradient
Convection in a dusty radio-frequency plasma under the influence of a thermal gradient
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DOI：
10.1088/1367-2630/13/8/083034
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发表时间：
2011-08
影响因子：
3.3
通讯作者：
M. Schwabe;L. Hou;S. Zhdanov;A. Ivlev;H. Thomas;G. Morfill
中科院分区：
文献类型：
--
作者：
M. Schwabe;L. Hou;S. Zhdanov;A. Ivlev;H. Thomas;G. Morfill
气体对流是在具有温度梯度的大气压条件下的系统中的常见现象。在低压条件下，对流可由沿表面沿着的蠕动流引起。这在流体物理学以及存在温度梯度的低压等离子体中具有重要的应用。在这里，我们可视化系统中的气体动力学和没有等离子体使用微粒作为示踪剂。从颗粒运动中可以识别出两种类型的气体对流，即在高气压下的自由（Rayleigh-Bénard）对流和在低压下由热蠕变引起的对流。使用微粒检测的气流分布与使用直接模拟蒙特卡罗方法的模拟中获得的气流分布进行比较。
Gas convection is a common phenomenon in systems under atmospheric pressure conditions with a temperature gradient. Under low pressure conditions, convection can be induced by creep flows along a surface. This has important applications in fluid physics as well as in low pressure plasmas in which a temperature gradient is present. Here, we visualize the gas dynamics in a system with and without a plasma using microparticles as tracers. Two types of gas convection have been identified from the particle motion, i.e. free (Rayleigh–Bénard) convection at high gas pressures, and convection induced by thermal creep at low pressures. The gas flow profile detected using the microparticles is compared with that obtained in a simulation using the direct simulation Monte Carlo method.