Development of Advanced Numerical Models for Two-Phase Heat and Mass Transfer Processes in Energy Systems

能源系统中两相传热传质过程的先进数值模型的开发

• 批准号: RGPIN-2018-05354
• 负责人: Ormiston, Scott
• 金额: $ 1.97万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=760257
• 关键词: Development; Advanced; Numerical; Models; Two

A heat exchanger transfers energy between two fluid flows and is a key component in many important processes in the power generation, chemical processing, food processing, pulp and paper, and refrigeration industries. Heat exchangers could be made smaller, less costly, and more energy efficient if high quality software models were available for design. Presently, however, only simplified design models are available for processes involving two-phase flow and phase change because of the complexity of the heat and mass transfer phenomena. Thus, designers cannot predict accurately the connection between performance and the refinement of the geometry or operating conditions. A costly and time-consuming prototype testing process must be followed to obtain a better design. The opportunity exists to improve the energy efficiency and performance in those heat exchangers by creating more accurate theoretical models that will replace the current relatively simple methods.Over many years, my research program has focused on the development of advanced, detailed, mathematical models of the fluid flow, heat transfer, and mass transfer in two-phase flows. We recently created the first elliptic sharp-interface model for two-phase falling film flow in ducts. The research proposed for the next five years will focus on developing new innovative theoretical models for flows of a falling film of liquid and a gas-vapour mixture with condensation, evaporation, or absorption phenomena. These new models are part of a long term vision of accurate software tools that will enable optimization of complex heat exchangers. The tools will help designers find inefficiencies in designs and see how design refinements affect the performance. The high quality of the proposed research work will be ensured by a strict focus on the fundamentals of the complicated heat and mass transfer phenomena at the interface between the liquid and the gas-vapour mixture, on validation of the models, and on new numerical solution methods to efficiently implement the models. The training of 11 HQP (3 Ph.D., 3 M.Sc., 5 B.Sc.) is proposed. After completion, graduate students will have the ability to supervise continued model development by other researchers, to work at a start-up company to develop, apply, and sell new software tools, or to perform CFD modelling for design or consulting.The new, more accurate models and numerical solution methods will benefit Canadian industry by serving as the basis for future software tools that will give a competitive edge to companies that design complex heat exchangers. Reduced time to market and optimized designs will reduce development, manufacturing, and operating costs for those companies. Future new models will be applicable for the design of condensers, evaporators, absorbers, distillation/desalination systems, and heat pipes.

热交换器在两种流体流之间传递能量，是发电、化学加工、食品加工、纸浆和造纸以及制冷行业中许多重要过程的关键组件。如果可以使用高质量的软件模型进行设计，则热交换器可以变得更小、成本更低且更节能。然而，由于传热传质现象的复杂性，目前只有简化的设计模型可用于涉及两相流和相变的过程。因此，设计人员无法准确预测性能与几何形状或操作条件的细化之间的联系。为了获得更好的设计，必须遵循昂贵且耗时的原型测试过程。通过创建更准确的理论模型来取代当前相对简单的方法，有机会提高这些热交换器的能源效率和性能。多年来，我的研究项目一直专注于开发先进、详细的数学模型两相流中的流体流动、传热和传质。 我们最近创建了第一个用于管道中两相降膜流的椭圆锐界面模型。未来五年的研究将重点开发新的创新理论模型，用于研究具有冷凝、蒸发或吸收现象的液体和气体-蒸汽混合物的降膜流动。这些新模型是精确软件工具长期愿景的一部分，能够优化复杂的热交换器。这些工具将帮助设计人员发现设计中的低效率问题，并了解设计改进如何影响性能。通过严格关注液体和气体-蒸汽混合物之间界面上复杂的传热和传质现象的基本原理、模型的验证以及新的数值解，将确保所提出的研究工作的高质量有效实施模型的方法。拟培养 11 名高级人才（博士 3 名、硕士 3 名、理学士 5 名）。完成后，研究生将有能力监督其他研究人员的持续模型开发，在初创公司工作以开发、应用和销售新的软件工具，或为设计或咨询执行 CFD 建模。更准确的模型和数值求解方法将作为未来软件工具的基础，使加拿大工业受益，这些工具将为设计复杂热交换器的公司带来竞争优势。缩短上市时间和优化设计将降低这些公司的开发、制造和运营成本。未来的新模型将适用于冷凝器、蒸发器、吸收器、蒸馏/海水淡化系统和热管的设计。