Lee Won-Ho, Kim Youn-Jea, Lee Jong-Chul
J Nanosci Nanotechnol. 2015 Nov;15(11):8446-50. doi: 10.1166/jnn.2015.11443.
Temperature in a free-burning arc used for synthesis of nanoparticles and nanostructured materials is generally around 20,000 K just below the cathode, falling to about 15,000 K just above the anode, and decreasing rapidly in the radial direction. Therefore, the electrode erosion is indispensable for these atmospheric plasma systems, as well as for switching devices, due to the high heat flux transferred from high temperature arcs to electrodes, but experimental and theoretical works have not identified the characteristic phenomena because of the complex physical processes. To the previous study, we have focused on the arc self-induced fluid flow in a free-burning arc using the computational fluid dynamics (CFD) technique. At this time, our investigation is concerned with the whole region of free-burning high-intensity arcs including the tungsten cathode, the arc plasma and the anode using a unified numerical model for applying synthesis of nanoparticles and nanostructured materials practically.
用于合成纳米颗粒和纳米结构材料的自由燃烧电弧的温度，通常在阴极下方约20000K，在阳极上方约15000K，并在径向迅速降低。因此，由于从高温电弧传递到电极的高热通量，电极侵蚀对于这些大气等离子体系统以及开关装置来说是不可避免的，但是由于物理过程复杂，实验和理论研究尚未确定其特征现象。在之前的研究中，我们使用计算流体动力学（CFD）技术专注于自由燃烧电弧中的电弧自感应流体流动。此时，我们的研究关注自由燃烧高强度电弧的整个区域，包括钨阴极、电弧等离子体和阳极，使用统一的数值模型以便实际应用于纳米颗粒和纳米结构材料的合成。
