MULTIphase Fluid flOw in nucleaR systeMs (MULTIFORM)

核系统中的多相流体流动（多种）

• 批准号: EP/V034898/1
• 负责人: Bruce Hanson
• 金额: $ 363.59万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FV034898%2F1
• 关键词: MULTIphase; Fluid; flOw; nucleaR; systeMs

MUFFIN will be a facility based at the University of Leeds with the dedicated aim to enable world class research on multiphase fluid flow, at a scale that is representative of a real system; i.e. pilot scale. Nuclear R&D is multi-disciplined, requiring a combination of techniques to provide a fit for purpose solution and with underlying disciplines, such as fluid flow, that cut across all aspects of research. Applications that rely on knowledge of multiphase fluid flow range from reactor cooling circuits, through solvent flows in reprocessing plants to liquid-solid mixtures in waste treatment. Significant challenges remain for legacy decommissioning of UK sites, e.g. sludge and silo retrievals which are primarily a multiphase flow problem. UK new build reactors also rely on a deep understanding of multiphase flow to characterise and control the complex chemistry on primary cooling circuits; e.g. deposition of crud on heat transfer surfaces is a multiphase problem. MUFFIN will allow academic researchers to understand the many challenging flow systems relevant to the current and future research challenges and answer questions of critical importance to the UK nuclear sector; such as precipitation, deposition, erosion and breakup of sludge wastes or CRUD particles, for safe pipeline transportation and reactor operation. It will help researchers understand the turbulence and heat transfer characteristics of bubbly reactor flows, as well as critically, future salt reactors, including the impact of gas injection on liquid mobility. It will provide state-of-the-art instrumentation for high-fidelity validation of computational fluid dynamics models that are used to predict performances in a variety of nuclear reactors, transportation or separation units. MUFFIN consists of three components:1. A suite of high precision, state-of-the-art, instruments for measuring a wide range of fluid flow and multiphase properties, 2. A pilot scale test bed, based on water with/out injected air [pressure (=< 5atm), temperature (=< 100degC)], that can be reconfigured to include instrumentation for fluid flow measurements from (1) and/or used to develop new instruments and equipment.3. A pilot scale test bed, based on molten chloride [pressure (=< 5atm), temperature (=<600degC)], that can be reconfigured to include instrumentation for fluid flow measurements from (1) and/or used to develop new instruments and equipment.MUFFIN will have a range of measurement techniques that are recognised as the most advanced available for these types of flows. For example, the UVP is a technique that enables non-intrusive velocity profiling through the pipe, with 1-D turbulence estimations and important. For solids in liquid and air, or gases in liquid, the size and shape of the particles or bubbles can be characterised using in situ FBRM, complemented by high speed imaging. The FBRM can also be coupled with X-ray dispersion analysis to understand particle phase stability, sedimentation and/or creaming. In gas-liquid flows, a wire-mesh sensor with a double layer of conductive electrodes, will enable the full characterization of bubble behaviour. For high fidelity, fluid dynamic information, 3-D LDV and PIV instrumentation capabilities will be available; low concentration particle-laden and bubbly flows. Lastly, a rotational rheometer will be available for full rheology characterisation of single-phase and multiphase systems up to temperatures of 600degC. For the molten salt system, high temperature ultrasonic probes will be available to enable non-invasive UVP measurements. Additionally, a test section will be built to incorporate a small sapphire window, which will give the ability to gain high fidelity velocity and turbulence information from the LDV. In addition to the above, each test bed will have a range of standard instrumentation, built-in. These will be high precision equivalents of those found on process plant and other research rigs.

MUFFIN将是利兹大学的一个设施，其专门目标是在代表真实系统的规模上实现多相流体流动的世界级研究；即中试规模。核研发是多学科的，需要结合多种技术来提供适合目的的解决方案，并与贯穿研究各个方面的基础学科（例如流体流动）相结合。依赖于多相流体流动知识的应用范围广泛，从反应堆冷却回路、后处理厂中的溶剂流到废物处理中的液固混合物。英国旧址退役仍面临重大挑战，例如污泥和筒仓回收，这主要是一个多相流问题。英国新建反应堆还依赖于对多相流的深入理解来表征和控制主冷却回路上的复杂化学反应；例如传热表面上的污垢沉积是一个多相问题。 MUFFIN 将使学术研究人员能够了解与当前和未来研究挑战相关的许多具有挑战性的流动系统，并回答对英国核部门至关重要的问题；例如污泥废物或 CRUD 颗粒的沉淀、沉积、侵蚀和破碎，以确保管道运输和反应器的安全运行。它将帮助研究人员了解气泡反应堆流的湍流和传热特性，以及至关重要的未来盐反应堆，包括气体注入对液体流动性的影响。它将提供最先进的仪器，用于计算流体动力学模型的高保真验证，这些模型用于预测各种核反应堆、运输或分离装置的性能。松饼由三个部分组成：1。一套高精度、最先进的仪器，用于测量各种流体流量和多相特性，2. 一个中试规模试验台，基于无注入空气的水[压力 (=< 5atm)，温度 (=< 100degC)]，可重新配置为包括 (1) 中的流体流量测量仪器和/或用于开发新仪器和设备。 3.基于熔融氯化物[压力 (=< 5atm)、温度 (=<600degC)] 的中试规模测试台，可重新配置以包括用于 (1) 中的流体流量测量的仪器和/或用于开发新的仪器和设备。MUFFIN 将拥有一系列被认为可用于这些类型流量的最先进的测量技术。例如，UVP 是一种能够通过管道进行非侵入式速度分析的技术，具有重要的一维湍流估计功能。对于液体和空气中的固体，或液体中的气体，可以使用原位 FBRM 并辅以高速成像来表征颗粒或气泡的尺寸和形状。 FBRM 还可以与 X 射线色散分析相结合，以了解颗粒相稳定性、沉降和/或乳化。在气液流中，具有双层导电电极的线网传感器将能够全面表征气泡行为。对于高保真度流体动态信息，将提供 3-D LDV 和 PIV 仪器功能；低浓度、充满颗粒和气泡的流动。最后，旋转流变仪将可用于对温度高达 600 摄氏度的单相和多相系统进行完整的流变学表征。对于熔盐系统，将使用高温超声波探头来实现非侵入式 UVP 测量。此外，还将建造一个测试部分，其中包含一个小型蓝宝石窗口，这将能够从 LDV 获得高保真速度和湍流信息。除上述之外，每个测试台还将内置一系列标准仪器。这些将是加工厂和其他研究设备上的高精度等效物。

项目成果

Simulation of bidisperse colloidal centrifugal sedimentation using a mixture viscosity model

• DOI: 10.1063/5.0171474
• 发表时间: 2023-12
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: Hangyu Chen;Thomas C. Sykes;Oguzhan Kivan;Xiaodong Jia;Michael Fairweather;T. Hunter