CAREER Plasma Heat Transfer: Research and Education

摘要- CTS-9733369 米林德·A慢跑 热等离子体越来越多地用于制造和材料加工，其中高温促进能量传输，自由电子和离子为化学反应提供环境。 典型的应用是等离子喷涂、化学气相沉积、烧结、合成、球化、废物销毁和净形状制造。 在所有这些应用中，来自等离子体的热传输对于确定产品的质量至关重要。 这项提案的工作是发展在等离子体及其与固体/液体表面的相互作用的传输过程的基本原理的增加的理解，并开发模型和传热的相关性。 与从等离子体到固体表面的热传递相关的过程明显比未电离气体复杂，因为电鞘靠近固体表面。 拟议的工作涉及到热等离子体中移动的单个粒子的热传递的研究。 中性气体、电子和离子的流动将被确定。 详细分析了电鞘层、带电粒子的产生和复合以及粒子的熔化过程。 熔化前沿将使用任意拉格朗日欧拉法确定。 数值预测将进行比较，在文献中的感应等离子体中的粒子运动的实验测量和气体流动中的液滴的可视化。 液滴形状变形的趋势将被预测为的函数的Alcohold的和韦伯数和液体/气体的粘度和密度比。

Abstract - CTS-9733369 Milind A. Jog Thermal plasmas are increasingly used in manufacturing and material processing where the high temperatures facilitates energy transport and the free electrons and ions provide an environment for chemical reactions. Typical applications are plasma spraying, chemical vapor deposition, sintering, synthesis, speroidization, waste destruction, and net shape manufacturing. In all of these applications, the heat transport from the plasma is critical in determining the quality of the product. This proposal work is to develop an increased understanding of the fundamentals of the transport processes in the plasma and its interaction with solid/liquid surfaces, and to develop models and correlations for the heat transfer. The processes associated with heat transfer from the plasma to a solid surface are significantly more complicated than for unionized gases because of the electrical sheath which lies close to the solid surface. The proposed work involves the study of the heat transfer to a single particle moving in a thermal plasma. The flow of the neutral gas, the electrons, and the ions will be determined. Detailed analyses of the electric sheath, the production and recombination of charged particles, and the melting of the particle will be made. The melting front will be determined using the Arbitrary Lagrangian Eulerian method. The numerical predictions will be compared to experimental measurements in the literature of particle motion in induction plasmas and to visualizations of liquid droplets in gas flows. Trends in droplet shape deformation will be predicted as functions of Reynold's and Weber numbers and liquid/gas viscosity and density ratios.