Research Initiation: Studies on Deposition of Flame Generated Particles

这项研究是对火焰生成的二氧化硅颗粒沉积到薄圆盘或圆柱体上的实验和理论相结合的研究。该理论将包括颗粒惯性、扩散、热渗透和凝聚对颗粒尺寸分布随位置变化的影响及其对沉积速率的影响。实验将测量局部气溶胶的浓度和粒度分布，总体沉积速率将由收集器的重量变化确定。该研究应有助于更好地了解用于制造光波导预制件的气相轴向沉积(VAD)工艺和外部气相沉积(OVD)工艺，以及从高温气体中沉积到表面的颗粒沉积的其他情况。

This research is a combined experimental and theoretical study of the deposition of flame generated silica particles onto a thin circular disk or circular cylinder. The theory will include effects of particle inertia, diffusion, thermophoresis, and coagulation on the variation of particle size distributions with position and its influence on the deposition rate. Experiments will measure local aerosol concentration and size distribution and the overall deposition rate will be determined by weight changes of the collectors. The research should provide improved understanding of the vapor axial deposition (VAD) process and the outside vapor deposition (OVD) process for manufacturing optical waveguide preforms and other cases, desired or otherwise, of particle deposition onto surfaces from high temperature gases.