Analysis of multiphase flows for functional coatings

功能涂层的多相流分析

• 批准号: RGPIN-2020-06773
• 负责人: Dolatabadi, Ali
• 金额: $ 1.46万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741421
• 关键词: Analysis; multiphase; flows; functional; coatings

This proposed research program on multiphase flows has been motivated primarily by the substantial and growing interest in applying the emerging suspension thermal spray process to produce so-called "functional" coatings. Conventional thermal spray processes such as plasma and high velocity oxygen fuel (HVOF) are already used extensively in the aerospace, automotive, and power generation industries to apply protective coatings on engine, landing gear, and turbine components that are exposed to heat, corrosion, erosion, and wear. They use particle diameters of tens of microns that are fed into the spray gun and heated and accelerated to high velocities. Recently, substantial research efforts have been applied to emerging suspension thermal spray (STS) systems that deposit much smaller nanoparticles and create coatings with superior performance. In STS, a liquid suspension of dispersed nanoparticles is injected into thermal spray flames, which atomize the suspension droplets. The liquid droplets then evaporate allowing the nanoparticles contained in the droplets to accelerate and melt as in a conventional thermal spray process. This technology shows significant promise to create coatings with feed rates suitable for many industrial applications. For example, the nano-structured coatings deposited by the suspension spraying technique demonstrate remarkable wear resistance, enhanced catalytic behaviour and superior thermal insulation. In STS, coating quality and functionality depend primarily on the suspension penetration into the jet, the primary and secondary atomization of the suspension, and the slurry droplet evaporation. Characterizing the multiphase flow and heat transfer associated with the suspension atomization in an all speed (subsonic to supersonic) flow is a challenging research topic requiring numerical and experimental studies. The proposed research program addresses both these aspects by studying multiscale multiphase spray process flows and the resultant functional coatings. We will explore the development of environmentally friendly durable omniphobic coatings, specifically, superhydrophobic, icephobic, and slippery liquid-infused porous surfaces. The computer codes that we generate to simulate the atomization process in industrial sprays also have broad applications in the design of nozzles for metal powder manufacturing, engine fuel systems, agricultural sprayers, dryers, and inhaled drug delivery systems. We anticipate that the results of this study will facilitate the manufacture of key aerospace components, and have a great impact on the Quebec aerospace industry. The technology will also find many applications in the automotive, power generation, and biomedical industries, all of which are important to the Canadian economy.

该提出的关于多相流的研究计划主要是由于应用新兴悬架热喷雾过程的实质性和日益兴趣，以生产所谓的“功能性”涂层。在航空航天，汽车和发电行业中，已经广泛使用了传统的热喷雾过程，例如等离子体和高速氧燃料（HVOF），以在发动机，起落架和涡轮机组件上施加保护性涂料，以暴露于热，腐蚀，腐蚀，腐蚀，腐蚀和磨损。他们使用数十微米的颗粒直径，这些直径被送入喷枪并加热并加速至高速度。最近，已经将大量的研究工作应用于新兴的悬浮热喷雾（STS）系统，该系统沉积了较小的纳米颗粒并创建具有出色性能的涂料。在STS中，将分散纳米颗粒的液体悬浮液注入热喷雾火焰中，这会使悬浮液滴雾化。然后，液滴蒸发，使液滴中包含的纳米颗粒像常规的热喷雾过程一样加速和融化。该技术显示出具有适用于许多工业应用的饲料速率的涂料的巨大希望。例如，通过悬浮液喷涂技术沉积的纳米结构涂层表现出显着的耐磨性，增强的催化行为和优质的热绝缘。在STS中，涂料质量和功能主要取决于悬浮液，悬浮液的主要和次要雾化以及浆液液滴蒸发。表征与悬浮雾化相关的多相流和热传递，以所有速度（超音速与超音速）流是一个充满挑战的研究主题，需要数值和实验研究。拟议的研究计划通过研究多尺度多相喷雾过程流动和由此产生的功能涂层来解决这两个方面。我们将探讨环保耐用的全恐怖涂料的发展，特别是超疏水，冰镇和湿滑的液态液态表面。我们生成的计算机代码用于模拟工业喷雾剂中的雾化过程，在用于金属粉末制造，发动机燃料系统，农业喷雾器，烘干机和吸入药物输送系统的喷嘴设计中也有广泛的应用。我们预计这项研究的结果将有助于生产主要的航空航天组件，并对魁北克航空业产生巨大影响。该技术还将在汽车，发电和生物医学行业中找到许多应用，所有这些应用对加拿大经济都很重要。