Analysis of two-phase flows for spraying processes

热喷涂广泛应用于航空航天、汽车、发电和生物医学行业，为暴露于热、腐蚀和磨损的起落架、发动机、涡轮机和植入物部件提供保护涂层。超音速火焰喷涂（HVOF）是制备高性能存款涂层的有效方法之一。我设计并制造了一个护罩附件，它大大扩展了HVOF工艺在沉积效率和灵活性方面的能力，允许使用陶瓷粉末进行涂层（美国专利号6，845，929）。在这项工作中，我们希望通过促进使用悬浮液原料的纳米尺寸的涂层颗粒的注射和沉积来进一步扩展该过程的能力。为此，我们需要有一个全面的了解雾化和液体破碎在所有速度的气体流动制度。拟议的工作将通过计算和实验研究来满足这一需求。轴向和径向悬浮液注射将建模和特点，以满足行业的需要，喷涂纳米粉末在适度的成本

Thermal sprays are extensively used in the aerospace, automotive, power generation, and biomedical industries to provide protective coatings on landing gear, engine, turbine, and implant components that are exposed to heat, corrosion, and wear. High Velocity Oxygen Fuel (HVOF) has been demonstrated to be one of the most efficient techniques to deposit high performance coatings. I have designed and built a shroud attachment which considerably expands the capabilities of the HVOF process in the areas of deposition efficiency and flexibility to allow coating with ceramic powders (U.S. Patent No. 6,845,929). In this work, we would like to further expand the capabilities of the process by facilitating the injection and deposition of nanosized coating particles using a suspension feedstock. For this purpose, we need to have a thorough understanding of the atomization and liquid fragmentation in all speed gas flow regimes. The proposed work will address this need through computational and experimental studies. Axial and radial suspension injections will be modeled and characterized to address the need of industries for spraying nanopowders at moderate cost