Interfacial Dynamics in Displacement Flows of Entangled Polymeric Fluids

美国国家科学基金会-化学和运输系统分部-颗粒和多相过程项目（1415）提案编号：0651497主要研究人员：Khomami， bamin隶属关系：田纳西大学，诺克斯维尔提案标题：在多相流动中，置换流动无处不在，在气体辅助注射成型、提高石油采收率、中空纤维膜的生产和基材涂层等许多领域都有巨大的实际应用。所提出的工作将整合聚合物物理学、粘弹性流体力学和计算科学的进展，以发展对线性和支链聚合物熔体位移流动界面动力学的机制理解。提出的活动的智力优点包括：聚合物浓度和结构对典型气-液置换流动界面动力学影响的综合实验研究。线性和支链纠缠聚合物溶液典型气-液置换流动界面不稳定性的直接模拟。确定热效应（即粘性加热和流体热敏性的耦合）对线性和支链纠缠聚合物溶液的典型气-液置换流动界面动力学的影响。拟议的研究将导致工业相关过程的实验验证的高保真过程模拟工具的发展-一个迫切需要计算工具来合理化商品和增值产品的净形状液态过程的设计和操作的领域。当前和未来技术的成功及其改善我们生活质量的潜力，在很大程度上取决于能否培养一支装备精良、能够应对现代科学和工程挑战的劳动力队伍。我们的主要目标之一是开发一个教学系统，通过课堂和实验室的经验，培养研究生和本科生在计算材料科学和工程。在过去十年中，美国各级教育的毕业生在这一领域明显落后于欧洲同行。因此，提出的研究/教育计划是必要和及时的。多样性和拓展：田纳西大学诺克斯维尔分校（UTK）的各种项目，如nsf支持的TLSAMP、管道工程多样性项目和GEM，将用于确保非裔美国人、西班牙裔美国人、美国原住民和女学生参与本研究。我们还将利用UTK广泛的外展基础设施，让K-12教师和高中生参与研究项目。基于互联网的传播：模拟模块、实验数据库、技术出版物和来自这项研究的报告将放在一个积极维护的网页上。中间件将用于基于web的仿真模块和数据可视化的执行。行业互动：涂料行业充分认识到拟议研究的价值。预计将与3M公司密切合作，在工业环境中实施这项研究的结果。在EPSCoR州建立研究基础设施：该提案将有助于田纳西州可持续研究基础设施的进一步发展，在以下方面：(i)培训学生，（ii）在UT发展专业知识，（iii）加强UTK，斯坦福大学和丹麦技术大学之间的研究网络。

National Science Foundation - Division of Chemical &Transport Systems Particulate & Multiphase Processes Program (1415)Proposal Number: 0651497Principal Investigators: Khomami, BaminAffiliation: University of Tennessee, KnoxvilleProposal Title: Interfacial Dynamics in displacement Flows of Entangled Polymeric FluidsIntellectual MeritDisplacement flows are omnipresent in a broad class of multiphase flows and are of tremendous practical application in many fields such as gas assisted injected molding, enhanced oil recovery, production of hollow fiber membranes and coating of substrates. The proposed work will integrate advances in polymer physics, viscoelastic fluid mechanics and computational science to develop a mechanistic understanding of interfacial dynamics in displacement flows of linear and branched polymeric melts. The intellectual merits of the proposed activities include: Comprehensive experimental investigation of the influence of polymer concentration and architecture on the interfacial dynamics of prototypical air-fluid displacement flows. Direct simulation of the interfacial instability of prototypical air-fluid displacement flows of linear and branched entangled polymeric solutions. Determination of the influence of thermal effects (i.e., coupling of viscous heating and the thermal sensitivity of the fluid) on interfacial dynamics of prototypical air-fluid displacement flows of linear and branched entangled polymeric solutions. The proposed research will result in development of experimentally validated hi-fidelity process simulation tools for industrially relevant processes - a field where computational tools are desperately needed to rationalize the design and operation of net shape liquid state processes for commodity and value added products. Broader Impacts The success of present and future technologies and their potential to improve our quality of life depend largely on the creation of a workforce that is well equipped to tackle modern science and engineering challenges. One of our main objectives is to develop a system of instruction, through both classroom and laboratory experiences, for training graduate and undergraduate students in computational material science and engineering. In the past decade, U.S. graduates at all levels of education have significantly fallen behind their European counterparts in this area. Hence, the proposed research/educational program is essential and timely. Diversity and Outreach: Various programs at the University of Tennessee, Knoxville (UTK), e.g., NSF-supported TLSAMP, Pipeline Engineering Diversity Program and GEM will be used to ensure participation of African-American, Hispanic-American, Native-American and female students in this research. We will also utilize the extensive outreach infrastructure at UTK to involve K-12 teachers and high school students in the research program. Internet Based Dissemination: The simulation module, experimental database, technical publications and presentations stemming from this research will be placed on an actively maintained web page. Middleware will be used for web-based execution of the simulation module and data visualization. Industrial Interactions: The coating Industry fully recognizes the value of the proposed research. A close collaboration with 3M Corporation in implementation of the results of this research in an industrial setting is envisioned. Building Research Infrastructure in an EPSCoR State: This proposal will contribute to the further development of a sustainable research infrastructure in Tennessee, in terms of (i) training students, (ii) developing expertise at UT and (iii) strengthening the research network between UTK, Stanford and Danish Technical University.