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: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=590889
• 关键词: Investigation; Mixing; Multiphase; gas; solid

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.

番茄酱或睫毛膏等常见非牛顿流体的混合是许多经济部门（包括化学、生物化学、食品、聚合物、纸浆和造纸、化妆品、废水处理和制药行业）中重要且具有挑战性的生产要素。混合等工艺操作的不可预测性会降低产品的均匀性，导致产品质量下降，并且需要使用过量的化学品进行进一步加工。据估计，仅北美化学工业每年因混合不良造成的损失就达 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）是大多数化学及相关行业的常见任务。在多相混合中，搅拌对于创建均匀悬浮液或增加气泡与液体之间的接触面积并促进有效混合等任务是必要的。因此，设计用于多相应用的混合系统引起了工业界的极大兴趣。混合设备的重要部件是叶轮，其在混合系统中用于使颗粒悬浮和/或分散非牛顿流体中的气体。一种推荐的混合系统使用同轴混合器，其结合了密间隙叶轮和开式叶轮。然而，这种在多相流中应用的混合系统设计背后的基础科学是有限的，并且通常依赖于反复试验，这是昂贵且低效的。该研究计划将开发一种通用方法来设计具有复杂流动特性（流变学）的流体的多相流混合系统。该计划将结合先进的流动可视化技术（例如粒子图像测速、光学探针和断层扫描）和先进的计算流体动力学（CFD）。所提出的实验和建模研究将提高我们对同轴混合器多相流混合现象的理解，并回答有关系统设计标准的一些基本问题。例如，它将研究有关混合器类型的选择、叶轮速度范围和旋转模式的问题，以及它们如何与复杂流变的多相流搅拌中的混合效果相对应。该研究计划的成果将为加拿大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、减少化学品成本和消耗、提高设备性能、更可靠的过程监测和控制、增加现有工厂的产量、提高产品质量以及提高能源效率。这项研究还将有助于 HQP 在混合技术、计算流体动力学、先进流体可视化技术、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。