Investigation of Mixing in Multiphase (gas, solid, and liquid) flow through Experimental and Numerical (Computational Fluid Dynamic) Techniques.

通过实验和数值（计算流体动力学）技术研究多相（气体、固体和液体）流中的混合。

• 批准号: RGPIN-2015-06174
• 负责人: Pakzad, Leila
• 金额: $ 1.82万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=708339
• 关键词: Investigation; Mixing; Multiphase; gas; solid

Summary: Mixing of common non-Newtonian fluids, such as ketchup or mascara, is an important and challenging element of production in many economic sectors, including the chemical, biochemical, food, polymer, pulp & paper, cosmetic, wastewater treatment, and pharmaceutical industries. Unpredictability in process operations, such as mixing, decreases the uniformity of the product, resulting in a decline in product quality, and the need to use excess chemicals for further processing. The annual loss due to poor mixing is estimated at $10 billion in North American chemical industries alone. Multiphase mixing-mixing of solid and liquid, liquid and gas, or solid, liquid and gas-is a common task in most chemical and related industries. In multiphase mixing, agitation is necessary for tasks such as creating homogeneous suspensions, or to increase the contact area between gas bubbles and liquid and promote effective mixing. Designing mixing systems for multiphase applications is thus of great interest to industry. The important parts of mixing equipment are the impellers, which are used in mixing systems to suspend particles and/or disperse gas in non-Newtonian fluids. One recommended mixing system uses a coaxial mixer, which combines a close clearance impeller and an open impeller. However, the fundamental science behind this mixing system design with application in multiphase flow is limited and often relies on trial and error, which is expensive and inefficient. This research program will develop a general methodology to design multiphase flow mixing systems for fluids with complex flow characteristics (rheology). The program will combine advanced flow visualization techniques (e.g. particle image velocimetry, optic probes, and tomography) and advanced computational fluid dynamics (CFD). The proposed experimental and modeling research will improve our understanding of mixing phenomena in multiphase flow with coaxial mixers and answer some of the fundamental questions about system design criteria. For example, it will investigate questions about the selection of mixer type, range of impeller speed, and rotation modes, and how they correspond to mixing effectiveness in agitation of multiphase flow with complex rheology. The outcome of this research program will contribute significantly to the Canadian chemical industry. Improved mixing systems can lead to capital cost savings, reduction in chemical cost and consumption, improved performance of equipment, more reliable process monitoring and control, increased throughput for existing plants, enhanced product quality, and increases in energy efficiency. This research will also contribute to the education and training of HQP in the field of mixing technology, computational fluid dynamics, advanced fluid visualization techniques, rheology, multiphase flow, coaxial mixers, and non-Newtonian fluids.

摘要： 番茄酱或睫毛膏等常见非牛顿流体的混合在许多经济部门是一个重要且具有挑战性的生产要素，包括化学、生化、食品、聚合物、纸浆和造纸、化妆品、废水处理和制药行业。工艺操作中的不可预测性，如混合，会降低产品的一致性，导致产品质量下降，并需要使用多余的化学品进行进一步加工。仅在北美化学工业，由于混合不良造成的年度损失估计就达100亿美元。多相混合--固体和液体、液体和气体或固体、液体和气体的混合--在大多数化工和相关行业中是一项常见的任务。在多相混合中，搅拌对于产生均匀悬浮液或增加气泡与液体之间的接触面积和促进有效混合是必要的。因此，设计用于多相应用的混合系统是工业界非常感兴趣的问题。搅拌设备的重要部件是叶轮，用于混合系统中悬浮颗粒和/或将气体分散在非牛顿流体中。一种推荐的混合系统使用同轴混合器，它结合了一个封闭间隙的叶轮和一个开放的叶轮。然而，在多相流中应用这种混合系统设计背后的基础科学是有限的，并且经常依赖于试验和错误，这是昂贵和低效的。该研究项目将为具有复杂流动特性(流变学)的流体设计多相流混合系统的一般方法。该计划将结合先进的流动可视化技术(如粒子图像测速、光学探头和层析成像)和先进的计算流体动力学(CFD)。提出的实验和模型研究将提高我们对同轴混合器多相流混合现象的理解，并回答关于系统设计准则的一些基本问题。例如，它将研究搅拌器类型的选择、叶轮转速的范围和旋转方式，以及它们与复杂流变性多相流搅拌中的混合效果如何对应的问题。该研究项目的成果将对加拿大的化学工业做出重大贡献。改进的混合系统可以节省资本成本，降低化学成本和消耗，改善设备性能，更可靠的过程监测和控制，增加现有工厂的生产能力，提高产品质量，并提高能源效率。这项研究还将有助于HQP在混合技术、计算流体动力学、高级流体可视化技术、流变学、多相流、同轴混合器和非牛顿流体领域的教育和培训。