2D Phase Doppler Particle Analyzer (PDPA) Laser Upgrade

二维相位多普勒粒子分析仪 (PDPA) 激光升级

• 批准号: RTI-2021-00704
• 负责人: Dolatabadi, Ali
• 金额: $ 10.9万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=718872
• 关键词: 2D; Phase; Doppler; Particle; Analyzer

Multiphase flows and specifically sprays have been acknowledged as an important phenomenon integral to many technological and natural systems. Among them are agricultural sprays, inhaled drug delivery systems, thermal spray coating, etc. One of the most effective instruments available for characterizing the droplet size and velocity distribution in such systems is a two-component Phase Doppler Particle Analyzer (PDPA). The Phase Doppler Method is based upon the principles of light scattering interferometry. Measurements are made at a small, non-intrusive optical probe volume defined by the intersection of two laser beams. The intersection of the two beams creates a fringe pattern within the probe volume. As a droplet (or particle) passes through the probe volume, it scatters light from the beams and projects the fringe pattern. The application of the proposed equipment is for the research on i) the development of functional and environmental protective coatings produced by the emerging suspension thermal spray processes, ii) advancement of the liquid accelerated cold spray (LACS) deposition system, iii) design the next-generation spray nozzles for more efficient injection and transportation of suspensions and complex fluids of nanoparticles in high speed flows, and iv) study of the COVID-19 transmission via respiratory droplets. By measuring the particle velocity and size distributions, we will develop correlations relating these parameters to the spray nozzle design, the inlet flow conditions as well as risk of transmission of the COVID-19 virus through respiratory droplets. Such correlations will not only be used by industry and health sectors, but will allow us to validate our numerical results and better understand the relationship between various governing parameters and the spray characteristics. The results of this study will facilitate manufacturing of key aerospace, automotive, and biomedical components, all of which are important to the Canadian economy.

多相流，特别是喷雾已被公认为是许多技术和自然系统不可或缺的重要现象。其中包括农业喷雾剂，吸入给药系统，热喷涂涂层等，其中一个最有效的工具，可用于表征液滴的大小和速度分布在这样的系统是一个双组分相位多普勒粒子分析仪（PDPA）。相位多普勒法是基于光散射干涉测量的原理。测量是在一个小的，非侵入性的光学探头体积由两个激光束的交叉定义。两个光束的相交在探头体积内产生条纹图案。当液滴（或颗粒）通过探针体积时，其散射来自光束的光并投射条纹图案。 所提出的设备的应用是用于研究i）通过新兴的悬浮液热喷涂工艺生产的功能性和环境保护性涂层的开发，ii）液体加速冷喷涂（拉克）沉积系统的进步，iii）设计下一代喷嘴，用于在高速流动中更有效地注射和输送纳米颗粒的悬浮液和复杂流体，及iv）COVID-19经呼吸道飞沫传播的研究。通过测量颗粒速度和粒度分布，我们将开发这些参数与喷嘴设计、入口流动条件以及COVID-19病毒通过呼吸道飞沫传播风险之间的相关性。这种相关性不仅将被工业和卫生部门使用，而且将使我们能够验证我们的数值结果，并更好地理解各种控制参数和喷雾特性之间的关系。这项研究的结果将促进关键航空航天，汽车和生物医学部件的制造，所有这些都对加拿大经济很重要。